My 87 4runner (22re) has a knock on the #2 cylinder. It sounds like it's coming from the bearing area. After about 15 minutes of driving the knock goes away. The oil pressure is good, even at idle. My question is; Any idea how long this motor may run with this condition?
Rod knock
Sep 20, 2003
5 Replies
Till the rod comes through the oil pan
Thanks, that tells me alot.
Are you sure it's a rod knock? I don't think it would go away after driving.
On the other hand, piston slap is notable for disappearing after the engine warms up (piston expands). Many modern engines seem to have that problem because of the short piston skirts in common use. GM's Vortec line is notorious for that.
Dick Ballard snipped-for-privacy@att.net
The way it goes away after driving sure leaves me hoping for the best. It has done this for 1500 miles and hasn't changed. It sure is loud for about 15 minutes (mainly noticable when accelerating) then fades to nothing.
Sounds more like a wrist pin. Try removing the plug wire when you first start the motor. If there isn't a knock it is more than likely the wrist pin.
Bill
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