258 No compression, Valve Cover off, What's missing? - JeepForum.com
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post #1 of 64 Old 09-22-2008, 01:02 PM Thread Starter
whittlecj
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258 No compression, Valve Cover off, What's missing?

Check this out. Any clue why- how???? I checked this motor when I bought it and found 120# compression in this cylinder according to my notes. Since then I've had no motor issues and have not taken the v/c off. The motor runs smooth (or at least I thought so) without this cylinder.

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post #2 of 64 Old 09-22-2008, 01:16 PM
j33pman
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I think I see a missing pushrod on #2 cylinder

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post #3 of 64 Old 09-22-2008, 01:20 PM Thread Starter
whittlecj
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Bingo - How the heck does that happen????
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post #4 of 64 Old 09-22-2008, 01:33 PM
Johnyakimo1855
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You better check for it in the oil pan or the lifter completely shelled
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post #5 of 64 Old 09-22-2008, 01:37 PM
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I swear those engines eat parts, i had the same thing happen to me except i never did find the rod... the lifter was fine tho

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post #6 of 64 Old 09-22-2008, 01:59 PM Thread Starter
whittlecj
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So ---- there is a chance the lifter fell apart leaving the rod to fall down past everything into the oil pan? Idea on where to go next?

Time for a 4.0 swap or is it possible that thing thing could be fixed pretty simply (replace lifter/rod?) The other cylinders all had 120# dry & wet except #6 which had 145#.
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post #7 of 64 Old 09-22-2008, 02:08 PM
Johnyakimo1855
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Well I would go ahead and pull the motor and tear into it. That is my .02. You need to see where the parts are and then you need to figure out why it happened.
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post #8 of 64 Old 09-22-2008, 02:09 PM
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I personally would rebuild. Mybe put the 4.0 head on the 4.2l like the others have done.
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post #9 of 64 Old 09-22-2008, 02:25 PM
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I would pull the head before I pulled the engine. It may be as simple as the PO not putting in the push rod. You will know whn you get into it. If the lifter is there and in good shape that is probably it. You may even want to drop another push rod in before pulling the head off.

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post #10 of 64 Old 09-22-2008, 03:13 PM
Johnyakimo1855
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CJ,

He stated earlier that the cylinder had 120 lbs of compression when he bought it. It happened after he had ran it a while.

John
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post #11 of 64 Old 09-22-2008, 04:07 PM Thread Starter
whittlecj
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Right - which is suprising that I missed this event. There was a period when it didn't run worth a flip and maybe it happened then when there were too many things going on to notice.
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post #12 of 64 Old 09-22-2008, 05:41 PM Thread Starter
whittlecj
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Alright - I believe I will yank the motor then pull the oil pan and see what is in it. Regardless, I figure I will also have to yank the head, so at that point I think pulling the motor is the smartest bet.
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post #13 of 64 Old 09-22-2008, 06:19 PM
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No reason to tear up the engine looking for a pushrod that was probably left out when assembled.
If it made it to the oil pan (Which I doubt, since there is no direct route for it to get there) and it's way too big to cause problems with the oil pump, I'd not worry about it too much.
(a mallet on the oil pan will tell you if the push rod is there, you will hear it bounce when you strike up on the oil pan)

If I took the oil pan off, I'd have a look, but I certainly wouldn't tear down or 'Rebuild' an engine that was running 'Smooth' and has good compression.

I'd try a fresh push rod in the open hole, and see if it was going to function correctly, and if it did, I wouldn't give it a second though.
---------------------

Since the distributor is in one tooth off in the direction of travel,
And there is a pushrod missing,
Those are rookie mistakes...

I could use a better (Closer/Larger) picture to look at for a lot of problems, but I'd say someone left a pushrod out when they assembled this engine, or this engine, like so many of the 258's, broke a pushrod...

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post #14 of 64 Old 09-22-2008, 06:22 PM
CJhollic
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Quote:
Originally Posted by Johnyakimo1855 View Post
CJ,

He stated earlier that the cylinder had 120 lbs of compression when he bought it. It happened after he had ran it a while.

John
He probably still has 120 pounds of compression. The spring will hold the valve closed. There is no push rod to open it.

The push rod may very well have been left out as I pointed out in my last post. I would put one in before I yanked the engine.

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post #15 of 64 Old 09-22-2008, 06:29 PM Thread Starter
whittlecj
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Quote:
Originally Posted by JeepHammer View Post

Since the distributor is in one tooth off in the direction of travel,
And there is a pushrod missing,
Those are rookie mistakes...

I could use a better (Closer/Larger) picture to look at for a lot of problems, but I'd say someone left a pushrod out when they assembled this engine, or this engine, like so many of the 258's, broke a pushrod...
1) This distributer is off? Timing seems fine @ 8degrees
2) If the push rod broke, would it be in the oil pan?
3) Tell me what you want a picture of and I'll get it asap.
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