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Oil Pressure Drops When Truck Warms Up?? Oil Pump???
- Whats wrong here? The truck is a 1988 GMC K 1500
started by Metallica19991
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May 13th 2009 at 8:34 PM
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Metallica19991
Average Member
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818 Posts 
Group: Members
Member Since: December 13th 2007
Location: NH, USA
2008-2009 Miles: 0
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OK heres the deal. My trucks oil pressure drops when the trucks warm. After it runs for about a half hour it will slowly lose its oil pressure. Is it the oil pump? Because i thought usually its the other way around. Let me know. I have a spare oil pump but i dont want to put it in unless i know for sure its the oil pump. Let me know. Thanks for any input
~Ben
1996 Skidoo Formula III 600
2001 Polaris TrailBlazer 250
1995 Polaris Scrambler 400 4X4
1989 Yamaha Blaster 200
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Site Supporter
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May 13th 2009 at 8:40 PM
[ Modified May 13th 2009 at 8:42 PM
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rsims16
Live By The Edge Of Your Seat
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776 Posts
Group: Members
Member Since: July 11th 2007
Location: Canton, Mass, USA
Current Sled: 1991 Indy 650
2008-2009 Miles: 405miles
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Check to see if the oil pressure switch is functioning properly.
Family Forever Forever Family
My reputation grows with every failure- George Bernard Shaw
As you climb the ladder of success make sure it is leaning against the right building- H. Jackson Brown Jr.
The only book that has a sad ending is a check book
My sleds
1989 Phazer
1990 Phazer
1991 Indy 650
1995 XLT special
1997 Skidoo Mach 1 700
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May 13th 2009 at 8:42 PM
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Metallica19991
Average Member
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818 Posts
Group: Members
Member Since: December 13th 2007
Location: NH, USA
2008-2009 Miles: 0
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The oil pump gauge works. That i now. Because when i revv the crap out of the motor the pressure goes back up then drops again when the motor slows down. which makes sense.
1996 Skidoo Formula III 600
2001 Polaris TrailBlazer 250
1995 Polaris Scrambler 400 4X4
1989 Yamaha Blaster 200
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May 13th 2009 at 9:17 PM
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bobp53916
Looking for Sno Pro motor mounts
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890 Posts
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Member Since: December 14th 2008
Location: Gwinner ND/Waupun WI
Current Sled: 99 ZR600/2000 Sno Pro
2008-2009 Miles: 500+
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Your bearings. You lose oil pressure when it warms up because the oil gets thinner. I always use to just run thicker oil. Its not your oil pump, you said it has good oil pressure when you first start it. As your bearings wear the clearance gets greater which will cause you eventually to lose oil pressure.
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May 13th 2009 at 9:26 PM
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dtmmil
Senior Member
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3182 Posts 
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Member Since: January 27th 2007
Location: Hawley, MN, USA
Current Sled: 99 xc700
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What is your pressure on start up, and how much does it drop, some drop is normal, as the oil is warmer it flows easier.
Clutched
Jetted, boyesen reed petals, boost bottle, 98xc carbs slides, 1371 needles, gutted air box
Homeade 7 1/2" riser
Homeade suspension drop brackets
shortened and blackened windshield
powermadd handguards
144 conversion, tracks usa extensions, custom tunnel extension and rear bumper, IQ flap, 1.25" track
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May 14th 2009 at 6:51 PM
[ Modified May 14th 2009 at 6:54 PM
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Metallica19991
Average Member
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818 Posts
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Member Since: December 13th 2007
Location: NH, USA
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When i start it cold the oil pressure is at like 30 but then as it warms up it slowly loses oil pressure to like 0 or very very close to 0. It will be at almost 0 after about half an hour of running. If its my bearings what do you guys reccomend i do? But the oil pressure goes back up when i revv it??? Still not the oil pump with that factor? Let me know... i need to get this thing fixed.
Oh and it also leaks oil after its warmed up as well. If that makes a difference i dont know?
1996 Skidoo Formula III 600
2001 Polaris TrailBlazer 250
1995 Polaris Scrambler 400 4X4
1989 Yamaha Blaster 200
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May 14th 2009 at 7:41 PM
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proxsledhead
if it aint broke dont fix it!
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Location: Kotzebue, Alaska, USA
Current Sled: MXZX 440 soon to be 700
2008-2009 Miles: 1865
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does the pressure drop anymore after it does?
FreeWill, Freeride, Freestyle
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May 14th 2009 at 7:47 PM
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Metallica19991
Average Member
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818 Posts
Group: Members
Member Since: December 13th 2007
Location: NH, USA
2008-2009 Miles: 0
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Like after a half hour the oil gauge is at "0" You cant see the gauge anymore. And then the truck will eventually die.
1996 Skidoo Formula III 600
2001 Polaris TrailBlazer 250
1995 Polaris Scrambler 400 4X4
1989 Yamaha Blaster 200
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May 14th 2009 at 8:46 PM
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driftpounder
Canadian Psycho
driftpounder can already hear the BBBBRRRRRAAAAAPPPPP! of the MBRP.
Updated Last Monday at 3:23 PM
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Location: Porcupine Plain/Saskatoon, Saskatchewan, Canada
Current Sled: 2006 Compfusion
2008-2009 Miles: 502
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You said in another topic that the motor uses alot of oil.
That means you have cleareance issues from ware, so the oil is thinning with heat, and it is being burnt and/or lost through leaks, plus its filling the added space in the bearings and other areas that have lots of ware.
Sounds like a rebuild is the solution to the problem or thicker oil.
'06 Fusion 700 0 miles just bought it
High Flow SLP Air Box
Hot Air Elimination Kit
MBRP
136/15/1.5 Ripsaw tracks usa kit
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May 14th 2009 at 8:54 PM
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greasemonkey
Northwoods Powdercoating
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1089 Posts
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Location: proctor, mn, USA
Current Sled: 05 Switchback
2008-2009 Miles: 1850
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Thicker oil is a temporary fix. The bearings are worn, mainly the cam bearings. If the oil pump was bad, you would have a bad lifter knock.
Time for a complete rebuild or another motor.
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May 15th 2009 at 6:02 AM
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Metallica19991
Average Member
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818 Posts
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Member Since: December 13th 2007
Location: NH, USA
2008-2009 Miles: 0
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Driftpounder that was a different motor that burned oil. That was in my 90' chevy step side. but i parted that truck out.
1996 Skidoo Formula III 600
2001 Polaris TrailBlazer 250
1995 Polaris Scrambler 400 4X4
1989 Yamaha Blaster 200
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May 15th 2009 at 8:11 AM
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dtmmil
Senior Member
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3182 Posts
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Member Since: January 27th 2007
Location: Hawley, MN, USA
Current Sled: 99 xc700
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Sounds like you could use a set of bearings in this one also, or another rebuild.
Clutched
Jetted, boyesen reed petals, boost bottle, 98xc carbs slides, 1371 needles, gutted air box
Homeade 7 1/2" riser
Homeade suspension drop brackets
shortened and blackened windshield
powermadd handguards
144 conversion, tracks usa extensions, custom tunnel extension and rear bumper, IQ flap, 1.25" track
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May 16th 2009 at 7:13 PM
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Metallica19991
Average Member
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818 Posts
Group: Members
Member Since: December 13th 2007
Location: NH, USA
2008-2009 Miles: 0
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How much usually would labor run if i had it completely rebuilt?
1996 Skidoo Formula III 600
2001 Polaris TrailBlazer 250
1995 Polaris Scrambler 400 4X4
1989 Yamaha Blaster 200
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May 16th 2009 at 7:52 PM
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RMK-KING
The Fabricator Moderator
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9123 Posts 
Group: Moderators
Member Since: October 3rd 2002
Location: Center and Roseglen, ND, USA
Current Sled: 09 RMK 700 & 06 IQr 600
2008-2009 Miles: 550
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Check the oil sending unit,we have had 3 pickups with low oil pressure. Replaced the sending unit that they all had high pressure again. If not that you are in need of a rebuild.
Current Line Up
-09 RMK Assault
-06 IQ R 600HO
-01 ProX 600
-95 XCR 600
Days get shorter,snow gets deeper,life gets better.
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May 16th 2009 at 9:24 PM
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dtmmil
Senior Member
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3182 Posts
Group: Members
Member Since: January 27th 2007
Location: Hawley, MN, USA
Current Sled: 99 xc700
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Quote originally posted by Metallica19991
How much usually would labor run if i had it completely rebuilt?
Depends, but how nice is the truck, is it worth the work? I would guess if you took it in and had it done most likely a couple thousand $$. Depends on how much you can do, may save you some money.
Clutched
Jetted, boyesen reed petals, boost bottle, 98xc carbs slides, 1371 needles, gutted air box
Homeade 7 1/2" riser
Homeade suspension drop brackets
shortened and blackened windshield
powermadd handguards
144 conversion, tracks usa extensions, custom tunnel extension and rear bumper, IQ flap, 1.25" track
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May 16th 2009 at 9:49 PM
[ Modified May 16th 2009 at 9:50 PM
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Fuglydude
Needs an 800 Ski Doo Summit!!!
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89 Posts 
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Member Since: December 29th 2008
Location: Rifle, Co, USA
Current Sled: 94" Arctic Cat 580 EXT
2008-2009 Miles: 350
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I'll bet lots of miles it time to rebuild or get a new one. just an old horse that needs some tlc
Life is to short sled hard!!!
94' Arctic Cat 580 Ext
90' Yamaha 570 Exciter
87' Polaris 440 Indy (big snow hill in the sky)
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May 18th 2009 at 12:42 AM
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AKnarrowback
We have all received a bail out. Jesus paid our debt 2000 years ago.
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867 Posts
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Member Since: October 1st 2006
Location: Fairbanks, Alaska, USA
Current Sled: 96 xlt rmk/sks
2008-2009 Miles: 16
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The motor is worn out and can't maintain pressure. Double check the sender unit first, but count on a rebuild or replace in the future.
96 xlt sks/rmk. custom 5.5 inch riser on the bars, custom air intake, custom front shock mounts, custom oil feed channel in block to inner pto end bearing, primer (I hate chokes), custom = I made it myself
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May 18th 2009 at 7:00 AM
[ Modified May 18th 2009 at 7:01 AM
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picman
Junior Member
picman is off to bag his buck. I hope. Skunked so far.
Updated Wednesday at 1:17 PM
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308 Posts
Group: Members
Member Since: January 15th 2009
Location: Marinette, WI, USA
Current Sled: 1998 Polaris Ultra
2008-2009 Miles: 1145
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Being that it is an older truck, you might not want to spend a couple k. Have any buddies that like to wrench on vehicles? You could consider a short block. If this is a 350 motor (or the metric equivelent), you would not have to pay a lot for it. In my area they are about $700.
Putting in a new set of mains only will probably boost your pressure to about 15 pounds depending on how bad the cam bearings are. So it is just a stop gap until you come up with alternatives.
Find the line between respect and fear....then flirt with it
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May 18th 2009 at 7:38 AM
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duece
Junior Member
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227 Posts
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Member Since: February 26th 2007
Location: brookfeild, ma, USA
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toss in a inline six it will outlast the truck
gerald j sullivan
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May 21st 2009 at 3:27 PM
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Metallica19991
Average Member
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818 Posts
Group: Members
Member Since: December 13th 2007
Location: NH, USA
2008-2009 Miles: 0
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Im going to try thicker oil. If that dont work im buying another 350 motor for $300
1996 Skidoo Formula III 600
2001 Polaris TrailBlazer 250
1995 Polaris Scrambler 400 4X4
1989 Yamaha Blaster 200
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May 21st 2009 at 10:16 PM
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Blackcat
Senior Member
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3715 Posts
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Member Since: October 24th 2004
Location: Stanley, ND, USA
Current Sled: 94 AC ZR580
2008-2009 Miles: Notta
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Just as another thing to throw out there, when was the last time you changed the oil filter? My '79 F150 was doing the exact same thing. The 400 in it enjoys it's oil so I just kept on adding oil and didn't pay attention to miles until it the oil pressure started acting up. Changed the filter and it's all golden again...until next time.
Just thought I would throw out an alternative option to try out before ordering a rebuild kit. If you do it yourself, you might be able to get away with dropping around $500 (complete rebuild kit) if you don't have to do machining. Probably add a couple hundred if you do, depending on whats needed. 350's are cheap to rebuild, plus you end up with something better then new (blocks get stronger over time) and don't have to worry about another engine going to crap on you for awhile...unless you get all wild with power adders.
'94 ZR580
Remember, the things we say and write not only effect those it was intended for, but can also effect the greater population...whether good or bad.
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06-07 Sleddin' Season Stats
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May 24th 2009 at 1:56 PM
[ Modified May 24th 2009 at 1:59 PM
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Metallica19991
Average Member
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818 Posts
Group: Members
Member Since: December 13th 2007
Location: NH, USA
2008-2009 Miles: 0
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Yeah i changed my oil filter. But i added thicker oil and it helped the motor for now. the oil pressure still gets low but not as bad. When the truck has been running for an hour the oil pressure likes to hang around 15 - 20
Im probably just going to take the truck in. It has a few things wrong with it. One the 4wd doesn't work. But i think its the actuator thats causing that problem. And when im in 4L it will slowly come out of gear and grind my T case. The linkage is probably just messed up on that because the truck has a 3" lift in it. And theres a few small other things. So im just going to take it in.
1996 Skidoo Formula III 600
2001 Polaris TrailBlazer 250
1995 Polaris Scrambler 400 4X4
1989 Yamaha Blaster 200
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May 25th 2009 at 8:29 AM
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dtmmil
Senior Member
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3182 Posts
Group: Members
Member Since: January 27th 2007
Location: Hawley, MN, USA
Current Sled: 99 xc700
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15-20 is plenty on a warmed up 350, was it getting to 0 before?
Clutched
Jetted, boyesen reed petals, boost bottle, 98xc carbs slides, 1371 needles, gutted air box
Homeade 7 1/2" riser
Homeade suspension drop brackets
shortened and blackened windshield
powermadd handguards
144 conversion, tracks usa extensions, custom tunnel extension and rear bumper, IQ flap, 1.25" track
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May 25th 2009 at 9:27 PM
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Metallica19991
Average Member
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818 Posts
Group: Members
Member Since: December 13th 2007
Location: NH, USA
2008-2009 Miles: 0
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Yeah like when i was running 5w-30 in it it was getting to 0 after about a half hour. I put some 10w 40 in it and it seems to run fine for the first 45 mins. Then it seems to slowly drop. By 1 hour of running time its at 0. But if i give it the gas then it will go back up and once i let off the gas it slowly drops again as the engine rpms idle down. I just replaced my oil pan gasket because it leaked. But i need a new head gasket because i dont have any compression in one of the cylinders and it burns coolant because steam is coming out of my exhaust pipe. So would a blown head gasket possibly cause me to lose oil pressure?
1996 Skidoo Formula III 600
2001 Polaris TrailBlazer 250
1995 Polaris Scrambler 400 4X4
1989 Yamaha Blaster 200
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May 25th 2009 at 10:00 PM
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redhot
Junior Member
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137 Posts
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Location: mn
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Nope, your motor is hashed! There's no mechanic in a can for fixing main bearings that are worn. Your only option is a rebuild or a different motor, or a different truck! You can put all the thick oil or Lucas additives in you want, but your motor is still going to be junk...JUNK
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