oilpump/screen gaskets
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From: Miami, FL.
oilpump/screen gaskets
Asking stupid questions is ok, right...
When I rebuilt an engine to put in my van (see sig.), I thought I may have not checked the crank correctly. (Got a clatter/chatter at mid to high revs after warm-up)
After reading posts, I hoped I was just experiencing oil starvation.
After installing mech oil guage, I was finally convinced to do it again, just waiting for the funds to improve. (Also hoping gauge wasn't crap).
After finally taking the oil pan off the old engine ('84 351W), I notice washers/gaskets both where the pump bolts to the block, and, where the screen bolts to the pump. The set I re-used had no gaskets so I assumed that was one of those parts that didn't need/want it.
Is it possible that missing gaskets are causing an air leak/oil starvation and a clatter at high rpms? I have almost 600 miles on the rebuild, and the symptoms/noises have not gotten better or worse. Least the oil stays clean and level.
TIA,
Munrow
When I rebuilt an engine to put in my van (see sig.), I thought I may have not checked the crank correctly. (Got a clatter/chatter at mid to high revs after warm-up)
After reading posts, I hoped I was just experiencing oil starvation.
After installing mech oil guage, I was finally convinced to do it again, just waiting for the funds to improve. (Also hoping gauge wasn't crap).
After finally taking the oil pan off the old engine ('84 351W), I notice washers/gaskets both where the pump bolts to the block, and, where the screen bolts to the pump. The set I re-used had no gaskets so I assumed that was one of those parts that didn't need/want it.
Is it possible that missing gaskets are causing an air leak/oil starvation and a clatter at high rpms? I have almost 600 miles on the rebuild, and the symptoms/noises have not gotten better or worse. Least the oil stays clean and level.
TIA,
Munrow
Last edited by munrow; Jun 16, 2005 at 01:10 PM.
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From: Miami, FL.
Thanks for bearing with me;
On start-up, guage shows 40 lbs @1000 RPM idle. As it warms, it eventually drops to about 5 lbs when completly warm. On the highway this morning, at 60 MPH and 2500 Rpm, it registered 20 lbs. 50 at 2100 RPM, it dropped the tiniest bit. No difference at 80 MPH. Back home, at idle, registered 5 lbs.
I think I'm just wishful thinking about the lack of gaskets. Seems I would have more pressure just idling.
For what it's worth, I first filled it with 10w40, ran it 30 minutes, changed it with the same, absolutely nothing showed in the used oil using a magnet and magnifier. Changed it with the same at 100 miles, again at 500 miles. Probably way, way much overkill, but an oil change is cheap.
Just to see, added a quart of 20w50 yesterday. Seems to have quieted it down the littlest bit
On start-up, guage shows 40 lbs @1000 RPM idle. As it warms, it eventually drops to about 5 lbs when completly warm. On the highway this morning, at 60 MPH and 2500 Rpm, it registered 20 lbs. 50 at 2100 RPM, it dropped the tiniest bit. No difference at 80 MPH. Back home, at idle, registered 5 lbs.
I think I'm just wishful thinking about the lack of gaskets. Seems I would have more pressure just idling.
For what it's worth, I first filled it with 10w40, ran it 30 minutes, changed it with the same, absolutely nothing showed in the used oil using a magnet and magnifier. Changed it with the same at 100 miles, again at 500 miles. Probably way, way much overkill, but an oil change is cheap.
Just to see, added a quart of 20w50 yesterday. Seems to have quieted it down the littlest bit
Last edited by munrow; Jun 18, 2005 at 08:47 AM.
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Joined: Oct 2004
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From: Fleming Ga
Did you have the cam bearings replaced during the rebuild? Use plasta guage on all the rod and main bearings to ensure they were in tollerance? Replace the oil pump and cleaned the pickup tube and screen ? Any one of the can be a source of low oil pressure. My oil pump for a 351 w came with the gaskets for the oil pump although I have seen some engines without the gasket. They're supposed to be machined surfaces and will seal enough together but I don't trust that and always use a gasket.
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Senior User
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From: Miami, FL.
Cam, pushrods and lifters came from old engine (the one in the vehicle) and were about 4-5 months old. Was truly **** about putting them in the same holes in the new motor.
When I took the stock cam out of the boneyard engine, it looked absolutely perfect. The cam bearings I could see also looked brand new (no markings at all), so didn't change cam bearings.
No plasti-gage. Was ASSuming too much because of the condition of the rest of the engine (cylinders perfect 30 over w/absolutely no ridge at top, pistons,cleaned, looked brand new w/no wobble at all at rods, cam looked perfect, crank journals looked perfect, all bearings looked the next best thing to perfect according to the rebuild book).
BTW, the engine came out of a '70's to mid-'80's truck that had been totalled in the rear.
Seems I truly am going to have to re-do it.
When I took the stock cam out of the boneyard engine, it looked absolutely perfect. The cam bearings I could see also looked brand new (no markings at all), so didn't change cam bearings.
No plasti-gage. Was ASSuming too much because of the condition of the rest of the engine (cylinders perfect 30 over w/absolutely no ridge at top, pistons,cleaned, looked brand new w/no wobble at all at rods, cam looked perfect, crank journals looked perfect, all bearings looked the next best thing to perfect according to the rebuild book).
BTW, the engine came out of a '70's to mid-'80's truck that had been totalled in the rear.
Seems I truly am going to have to re-do it.
Last edited by munrow; Jun 20, 2005 at 09:36 AM.
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