Express 2500 05, oil pressure dropped
#1
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Location: Lancaster, Ca
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Express 2500 05, oil pressure dropped
Was driving my van and suddenly, heard a knocking noise and oil pressure dropped to zero. Replaced oil, oil filter and oil pump. Pressure didn't recover and noise still there, any insights? Ideas?
Please help.
Please help.
#2
Super Moderator
Professional Mechanic
Professional Mechanic
Oil pressure is not created by the oil pump it is created by bearing clearance. You have spun a bearing and need a new engine. Once an engine is knocking it is finished
#3
Let me guess... no previous problems, then one day your engine automagically lost 3 qts of oil without smoking, obvious leaks or blowing a gasket? More than one person has had that with the 5.7L... what engine is in yours? How much oil was in it when the problem occurred?
On mine, it was the #1`rod/main bearing that spun. I did buy some time by installing oversize bearings every few weeks but it didn't take long until it was beyond even a .060 bearing doing any good.
Yep - if it's knocking, it's pretty much toast. 5.7L's also seem to have a problem w/ wrist pins - they go bad & then that rod hammers out the rod bearing on the crank.
Remember when all you needed to fix a 350 was some duct tape & a hammer?
On mine, it was the #1`rod/main bearing that spun. I did buy some time by installing oversize bearings every few weeks but it didn't take long until it was beyond even a .060 bearing doing any good.
Yep - if it's knocking, it's pretty much toast. 5.7L's also seem to have a problem w/ wrist pins - they go bad & then that rod hammers out the rod bearing on the crank.
Remember when all you needed to fix a 350 was some duct tape & a hammer?
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