5.7 hemi oil pressure issues
#563095
12/26/09 11:22 AM
12/26/09 11:22 AM
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Joined: Jan 2003
Posts: 2,623 Ca Registered: Mar-2001
hemiallen
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,623
Ca Registered: Mar-2001
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A good friend of mine is having issues with his ram truck's 5.7 hemi . Below is his email to me:
my 03 dodge with the 5.7 hemi has had oil pressure issues for a while it would loose pressure but you could turn it off and when you restarted it the pressure would come back up for a while.i could cure this for a while by changing the oil. last week i had a valve spring break on my #2 cylinder. i replace the spring and bent push rod. when i started and drove it it i lost all oil pressure and can not get it to come back up by restarting it.I'm going to replace the oil pump but would like your opinion on this, if there might be something besides the oil pump causing the problem. I've built lots of rb b and a motors but this is the first time I've worked on the new hemi motor.
Anyone have any idea's to toss his way?
Thank you
Allen
'05 Quad cab hemi truck- Flame red- magnaflow exhaust
70-440 cuda-
74-360-4v Challenger- new driver car
EX vehicles:
66 charger Drag car- 10.80 at 123 mph
57 imperial 392 Hemi
1960 Sanger V drive- mondello-built 392 hemi
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Re: 5.7 hemi oil pressure issues
[Re: cantspel]
#563098
12/26/09 12:01 PM
12/26/09 12:01 PM
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Joined: Jan 2003
Posts: 2,623 Ca Registered: Mar-2001
hemiallen
OP
master
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OP
master
Joined: Jan 2003
Posts: 2,623
Ca Registered: Mar-2001
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Thanks.
Hoping someone has seen "other" issues with oil pressure and the 5.7 hemi, but also hoping the oil pump changeout fizes the problems. I have 110k on my 05 QC hemi and sans a cracked exhaust manifold mine has been very reliable. My son borrowed it Christmas eve, and said she has a lot of gnuts compared to his 99 chevy 350 4x4...lol
Thank you
Allen
'05 Quad cab hemi truck- Flame red- magnaflow exhaust
70-440 cuda-
74-360-4v Challenger- new driver car
EX vehicles:
66 charger Drag car- 10.80 at 123 mph
57 imperial 392 Hemi
1960 Sanger V drive- mondello-built 392 hemi
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Re: 5.7 hemi oil pressure issues
[Re: hemiallen]
#563099
12/26/09 12:46 PM
12/26/09 12:46 PM
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Joined: Jan 2003
Posts: 17,844 S.E. Michigan
ZIPPY
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 17,844
S.E. Michigan
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His description sounds like it lost prime/somehow got an air pocket trapped inside. He might want to try replacing the oil filter and completely filling the new filter with oil (may take over an hour for it to soak into the element) to see if that makes any difference.
He also might want to try loosening the filter and/or loosening the oil pressure sender, starting it, allowing it to make a mess for a second and then trying again. The idea is to purge air.
If none of that gets it, then....
Don't blame him a bit for wanting to put a pump in it, but they aren't ridiculously prone to failure.
If he's set on doing the pump, I'd probably shotgun it/do the pump along with the stuff below to make sure it isn't sucking or pushing air.
There is an O ring between the oil filter adapter and the block that might be slowly failing/might be twisted in the groove or something (Actually I'd probably do that first since it's the least invasive, and should take under and hour to replace).
Also the pickup tube has a o ring that can potentially fail. The pickup tube mounting flange is, if I remember right, swedged on (not welded), and I would want to make sure the whole pickup tube is air tight. I would also check out the pickup to pan clearance.
Broken spring means the lifter could have been launched upward enough to expose the oil passage to air. Hopefully the lifter retaining yoke is still in good shape...unfortunately the only way to inspect it is to remove that head. It's probably fine, they are not known to break even though they're made of plastic.
About the only good news in the whole deal is...once everything around the radiator + the upper core support is removed, it makes a fairly comfortable place to sit/stand and work on it. Having done a couple top end + cam + header jobs I can say from experience....the trucks are MUCH easier to work on than the same engine in a car chassis.
The pump wraps around the crankshaft in the front, btw.
Rich H.
Esse Quam Videri
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Re: 5.7 hemi oil pressure issues
[Re: SALEM1912]
#563101
12/26/09 04:05 PM
12/26/09 04:05 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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thanks guys and thanks Allen.I went a head and joined you site looks like a good place. I think i have been having problems with the pressure relief valve for the last yr.when i changed the exhaust valve spring and push rod i noticed that i had some sludge in the heads and on the exhaust rockers.Since I'll have to pull the pan anyways to check the pick up I'm going to go a head and put a new oil pump on. and hopefully that will be the end of my problems.
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Re: 5.7 hemi oil pressure issues
[Re: stumpy]
#563103
12/26/09 04:14 PM
12/26/09 04:14 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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i believe the lifter is fine i started it without the valve cover and all the rocker arms appear to be opening and closing equally
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Re: 5.7 hemi oil pressure issues
#563104
12/27/09 05:50 PM
12/27/09 05:50 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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pick up was clogged with sludge. but what worries me now is that there was bearing material in the pan
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Re: 5.7 hemi oil pressure issues
[Re: ZIPPY]
#563106
12/27/09 07:06 PM
12/27/09 07:06 PM
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Anonymous
Unregistered
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Anonymous
Unregistered
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i change it last week when i first noticed the miss. pvc hose was deteriorated and i thought that might be the cause of the miss at first
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