pushrod installed wrong

azzkikr · 03-01-2008, 11:53 AM

Just wondering if anyone had this issue before, just had a stroker motor built 400-512, drove the car a few miles and rocker arm was loose and push rod danging around. Builder came out and put a new rocker arm on and replaced pushrod, same thing happened a few miles later. Has roller lifters, solid cam, anyway i pulled valve cover and was able to position the pushrod in the hole of the lifter, they had it installed sort of on the side, and i was wondering why there was much more thread exposed on the adjustment screw. So now after driving for a short time, engine is missing badly, did a compression test and now 0 compession in that cylinder. Haven't pulled the head yet. (indy), I don't think the car was ever running on full 8cylinders but still pull like a monster so didin't think anything was wrong, What do you think is damaged, valve, stem, guide? Hopefully nothing major. Builder says i must've overreved it, but when i tell him this story, he does'nt get it. Opinions?

CAT-TECH · 03-03-2008, 08:45 PM

We get these issues on many diesels that come into the shop. We either find a flattened cam lobe (maybe not properly broke in?) or a lifter roller that walked out of its seat. Your adjustment screw should not be any different thread height. Are you sure he put the same length push rods in? Check to see if the push rod is bent too, we see that alot. With what you say "they had it installed sort of on the side" It might be a bent push rod.

03-01-2008, 11:53 AM	#1 (permalink)
azzkikr Junior Member Join Date: Feb 2008 Posts: 16	pushrod installed wrong Just wondering if anyone had this issue before, just had a stroker motor built 400-512, drove the car a few miles and rocker arm was loose and push rod danging around. Builder came out and put a new rocker arm on and replaced pushrod, same thing happened a few miles later. Has roller lifters, solid cam, anyway i pulled valve cover and was able to position the pushrod in the hole of the lifter, they had it installed sort of on the side, and i was wondering why there was much more thread exposed on the adjustment screw. So now after driving for a short time, engine is missing badly, did a compression test and now 0 compession in that cylinder. Haven't pulled the head yet. (indy), I don't think the car was ever running on full 8cylinders but still pull like a monster so didin't think anything was wrong, What do you think is damaged, valve, stem, guide? Hopefully nothing major. Builder says i must've overreved it, but when i tell him this story, he does'nt get it. Opinions?

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03-03-2008, 08:45 PM	#2 (permalink)
CAT-TECH Member Join Date: Jan 2008 Location: Cali Posts: 42	We get these issues on many diesels that come into the shop. We either find a flattened cam lobe (maybe not properly broke in?) or a lifter roller that walked out of its seat. Your adjustment screw should not be any different thread height. Are you sure he put the same length push rods in? Check to see if the push rod is bent too, we see that alot. With what you say "they had it installed sort of on the side" It might be a bent push rod.