Your oil pump will fail., And it will kill your engine. |
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Your oil pump will fail., And it will kill your engine. |
Valy |
Sep 15 2011, 09:38 PM
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#21
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Senior Member Group: Members Posts: 1,677 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
I'm rebuilding a 2.0L and posted a lot of pictures in a different thread.
One of the pictures showed the oil pump and Jake immediately noticed that the pump failed. Went back to the engine and saw how the oil pump touched the cam gear and shred off the nits holding it. Being such an anal guy, I took same time today to understand why did the oil pump fail? The red axle in the picture above it the one that protruded through the pump cover. There's nothing that holds it in place except the friction between it and the cover! So Why does it move? This red axle goes into a cavity of the oil pump case (rightmost in the figure). The cavity is almost snug-fit to the axle but oil can infiltrate around the axle into the cavity. When the pump works, there is a bit of oil pressure in the pump that causes the oil in the cavity to push the axle out; just like a hydraulic piston. The force is small but it's constantly there. As the axle moves, more oil flows in and that keeps pushing the axle out. Over the time, that axle is pushed out of the pump cover until it starts touching the cam gear, shredding the nits that hold it. Eventually, the nits will brake or the axle will block the movement of the camshaft and something else will brake or your camshaft bearings will give due to the vibration inducted by the hits. The aftermarket oil pumps are build differently, with no axle that can protrude into the motor, making them a good upgrade to your old original pump. Make yourself a note to replace that old oil pump at the first occasion. I will even recommend to create that occasion before it's too late. |
Cap'n Krusty |
Sep 15 2011, 10:54 PM
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#22
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Cap'n Krusty Group: Members Posts: 10,794 Joined: 24-June 04 From: Santa Maria, CA Member No.: 2,246 Region Association: Central California |
In the 38 years I've been intimately involved with T4 engines, from the REAL T4 cars to the busses to the 914, I've NEVER seen an oil pump failure. Never. I believe it can happen, but it's gotta be rare, and due diligence during a rebuild should catch impending issues. Actual failure in progress would result in a clatter that would be difficult to ignore by nearly anybody.
The Cap'n |
Valy |
Sep 16 2011, 11:16 AM
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#23
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Senior Member Group: Members Posts: 1,677 Joined: 6-April 10 From: Sunnyvale, CA Member No.: 11,573 Region Association: Northern California |
In the 38 years I've been intimately involved with T4 engines, from the REAL T4 cars to the busses to the 914, I've NEVER seen an oil pump failure. Never. I believe it can happen, but it's gotta be rare, and due diligence during a rebuild should catch impending issues. Actual failure in progress would result in a clatter that would be difficult to ignore by nearly anybody. The Cap'n Cap'n, So is your point that what I show in the pictures is just "failure in progress"? From my perspective, this is enough failure to cause a rebuild. Anything more and it will be catastrophic. More important, those original pumps are NLA and the aftermarket ones won't fail that way. How do you recommend to solve the problem? |
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