Wierd engine prob..need answers quick! - Off-Road Forums & Discussion Groups
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post #1 of (permalink) Old 08-31-2000, 06:44 PM Thread Starter
 
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Wierd engine prob..need answers quick!

1984 CJ-7 with 258. 81,000 miles, HEI, Weber 38
Today, when I started my jeep up to drive home from work, it sounded like someone had removed a spark plug wire. I quickly checked all possible easy fixes, but the ignition was fine. I limped the short way home and began troubleshooting. Since I had an occasional tapping,(but what engine of this vintage doesn't!) I pulled the valve cover for a looksee.
What I found really puzzles me. The #1 cylinder intake pushrod was just lying in it's lifter bore, outside of the rocker. I checked the pushrod against it's neighbor, and it's not bent, or anymore short/worn than the other. Same with the rocker. I looked down at the lifter, from the top it looks fine. I droppped the pushrod back down, manually rotated the engine 360, and it seemed to move up and down in a normal fashion. I reassembled the pushrods, torqued down the rocker arms, drizzled some oil over them, then fired it up and watched the valve train. I ran it till it started to make a mess, and everything seemed fine.
Whats up with that?? The rocker bolts WERE NOT loose, I guess I should add, and the last shutdown this morning was fine, no backfire or anything.
Someone please help me!
TIA
Bob

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post #2 of (permalink) Old 08-31-2000, 07:44 PM
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Re: Wierd engine prob..need answers quick!

Maybe the lifter collapsed momentarily freeing the pushrod from it`s seat in the rocker and "pop" out she comes. Just a thought .

Jeff

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post #3 of (permalink) Old 08-31-2000, 07:57 PM
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Re: Wierd engine prob..need answers quick!

did you check for a broke or sagging valve spring?I like jeepzilla's idea of a temperary collapsed lifter,possibly a sticky piston inside the lifter? my two cents

jsjps
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post #4 of (permalink) Old 08-31-2000, 08:23 PM Thread Starter
 
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Re: Wierd engine prob..need answers quick!

The valve spring looked normal, and appeared to compress normally when both turning it over by hand and also when I briefly ran it.
Geez, I REALLY hope it was just a fluke. I never heard of this happening before, and I wasn't planning on doing the "engine phase" of my jeep yet!!
Bob


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