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Interference or not?
Posted 13 January 2003 - 12:16 PM
honestly, I can't see how just the coolant alone would cause it to jump timing unless the belt was not properly tensioned.
Posted 13 January 2003 - 12:59 PM
Posted 14 January 2003 - 03:38 AM
Posted 14 January 2003 - 07:44 AM
Posted 14 January 2003 - 10:37 AM
Posted 14 January 2003 - 12:26 PM
Especially if you're seeing black goo from it.....
Posted 15 January 2003 - 07:36 PM
the EJ20T is definitely interferential, both Japanese and American models. This info comes from a colleague who specializes in high performance Subaru stuff, and whose word I trust.
As for the EJ25 SOHC, do you guys want me to go to the trouble of posting photos of a couple of trashed heads we have? Trashed because the timing belt broke and the valves hit the pistons. The pistons are busted up and the valves are broken off completely. This particular engine is a 2001 model.
(Slipped timing at only 2 teeth may not cause a problem. Usually, the belt needs to be 3 or more teeth off for parts to connect. OR, revving over redline!)
Man, you were lucky!!
Interference can come from pistons and valves connecting OR valves hitting each other. Both are possible. The issue is that not enough room is left for either to clear each other. It's part of the price you pay for the added performance and efficiency.
Posted 15 January 2003 - 07:53 PM
I read in a 2001 Impreza owners manual that the computer will cut fuel to prevent engine over rev. Didn't say at what RPM though. Said "in the red zone". Float the valves in an interferance engine and things could go to he!! in a hurry, cumputer may not be fast enough.
Posted 16 January 2003 - 09:21 AM
Posted 17 January 2003 - 01:51 PM
Still not 100% confident of why this happened in the first place. I have it at an area shop that works on Subys all the time and he was confident that he'll find the root cause of the problem when he removes the old head.
Posted 17 January 2003 - 06:31 PM
Posted 17 January 2003 - 08:45 PM
There are a variety of reasons, starting with the fact that the oil passages in the heads are ridiculously small.
Probably the most likely reason is the plate on the back of the oil pump that backs off, lowering not necessarily oil pressure, but circulation, just enough to cause problems.
Subaru never did anything to keep the small screws holding it on from loosening up. The oil gets out the sides of the pump and circulates like crazy in that area of the block, but any distance away from the pump and the circulation can be dismal.
Eventually, premature bearing wear can result from this also.
Best advice, when you replace front seals and pump o-rings, put those screws back with a little bit of Locktite!
Posted 18 January 2003 - 03:28 PM
you write "pump o ringS" .
I'm preparing to replace the belt on my 96 Brighton and was under the impression that there was one (1) oil pump o ring to replace.
Is there more than one.
The dealer where I buy my parts only sold me one.
Posted 18 January 2003 - 06:32 PM
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