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dluyk
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Rebuild or Let It Be?
07/11/19 at 13:37:57
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Hello all, we are in the beginning stages of a 1953 CJ3A restoration, still planning..

We have toyed with the idea of having the engine rebuilt. We just did a compression test on the ol' girl and here are the results:

Dry: #1: 110, #2: 115, #3: 115, #4: 110
Wet: #1: 115, #2: 120, #3: 120, #4: 120

The engine seems to run fine but we have an air/fuel mixture issue we havn't figured out. It seems to run rich.

The question we have for you is this: do those compression numbers seem healthy to you? We recognize that we will never have a better opportunity to rebuild the engine, but we're not interested in spending extra time and money on an engine rebuild especially if it's not really necessary. Original odometer read just over 62k miles.
  
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mtnman37879
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Re: Rebuild or Let It Be?
Reply #1 - 07/11/19 at 14:11:24
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Your compression is fine. Rebuild your carb.
  

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oldtime
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Re: Rebuild or Let It Be?
Reply #2 - 07/11/19 at 16:35:19
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Those are pretty good compression readings for an L-head.

There is great benefit in knowing exactly what you have.
I suggest you pull the head off and take a close look at the valves etc.
With good lighting and magnifying glass look for hairline cracks between the #2-3 exhaust valves.
If all looks well; do a precision valve adjustment with each valve fully seated then buy a Copper head gasket and call it good.

That should help ensure you have a dependable engine with little time /expense.

Do not clean deck area or pistons with a wire wheel nor any abrasives!
A single piece of wire can easily ruin a bore.
  
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