Engine Resource List - JeepForum.com
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post #1 of 16 Old 07-02-2020, 02:35 PM Thread Starter
Onelick
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Engine Resource List

Howdy,
After doing compression testing on my 1983 cj5 with a 4.2l, I found out that it needs rebuilt. So I spent about 4 hours last evening trying to find pros and cons of different engine rebuild options and I got lost in the forest. Is there just one place that lists all the different pros and cons? ex: 4.0 stroker, 4.2 block with 4.0 head for Fuel injection, rebuild 4.2 with added FI, rebuild 4.2 with BBD nuttered, etc.
Thanks,
Onelick


1983 cj5 6cyl
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post #2 of 16 Old 07-02-2020, 02:42 PM
LumpyGrits
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What were the readings?
Was the engine warm?
Did you have the throttle completely open while testing?
What's your hot engine oil pressure?
What weight engine oil?
How many miles on thus engine?

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post #3 of 16 Old 07-02-2020, 02:52 PM Thread Starter
Onelick
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This was a barn find and the engine has not run in 6 years. I tried to start it 3 years ago when I bought it, but I don't think I had enough gas in the tank for the fuel pump to work. So, the engine was cold, the throttle was not completely open, no clue what the oil pressure was, 10w30, 86,000 miles on the motor. The previous owner said it ran when he parked it, went through oil like crazy, there's evidence of blowby on the passenger side of the motor. There's pictures of the motor in the thread on the ground cables that you helped me with (Thanks a bunch). If I'm able to get this running without rebuilding it, I'll buy you a beer or two (cases) when I'm out that way on wildland fires.
Thanks,
Onelick

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post #4 of 16 Old 07-02-2020, 06:50 PM
pedal2themetai
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HI He wanted to know what was your compression test numbers... using a lot of oil could just be gaskets.. and some blow by could just be a plugged PCV system. In the pictures you posted in your earlier posts it doesn't look like an overabundant of oil blow by..
good luck
tim
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post #5 of 16 Old 07-02-2020, 07:37 PM Thread Starter
Onelick
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yeah, sorry, I forgot those. Bright shiny things distracted me.
#1- 160 psi
#2- 90 psi
#3- 60 psi
#4-20 psi
#5- 40 psi
#6- 120 psi

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Onelick

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post #6 of 16 Old 07-02-2020, 08:23 PM
LumpyGrits
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Test again with throttle 100% open.

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post #7 of 16 Old 07-02-2020, 08:32 PM
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don't panic, some of that could just be bits gummed up. Sticking lifters and valves would account for some of it. Do test again with throttle open dry and then open wet.

then take the valve cover off and look at the valves for low cylinders,
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post #8 of 16 Old 07-02-2020, 08:34 PM
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post #9 of 16 Old 07-02-2020, 10:22 PM
pedal2themetai
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Quote:
Originally Posted by BagusJeep View Post
don't panic, throttle open dry and then open wet.

then take the valve cover off and look at the valves for low cylinders,
Hi when he says wet he means to squirt some oil in the cylinder and re check the compression. the oil helps seal the rings.. since its been sitting for a while they are very dry. they are usually wet from the oil splashing around in the pan and it naturally helps it seal.
good luck
tim
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post #10 of 16 Old 07-03-2020, 12:08 AM
BagusJeep
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Quote:
Originally Posted by pedal2themetai View Post
Hi when he says wet he means to squirt some oil in the cylinder and re check the compression. the oil helps seal the rings.. since its been sitting for a while they are very dry. they are usually wet from the oil splashing around in the pan and it naturally helps it seal.
good luck
tim
Sorry, I did not mean to do it in the rain

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post #11 of 16 Old 07-03-2020, 05:10 AM
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Quote:
Originally Posted by Onelick View Post
This was a barn find and the engine has not run in 6 years.
Onelick

My suggestion is to get the engine running and let it warm up before doing another compression test. Given the length of time the engine has been sitting, you could be looking at collapsed lifters, sticky valves, dry cylinder walls, or sticky rings. All these conditions can effect compression and many if not all can disappear after the engine has been started and allowed to warm up.
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post #12 of 16 Old 07-04-2020, 11:21 AM Thread Starter
Onelick
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Thanks to everyone for the help. I'll work on getting it running. Are there any precautions I should take prior to getting it running? I think I have all the vacuum lines routed they way they are supposed to be and not the way the PO had them. I've already changed the oil, I'll do it again since it's been a year or two. The coolant is still a pretty green, I'll wait to change that until I know if I'm doing anything with the motor or not. Anything else?
Sorry it took me awhile to reply, I'm stuck at the firehouse doing a 48. 24 on OT.
Thanks,
Onelick

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post #13 of 16 Old 07-04-2020, 03:49 PM
LumpyGrits
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Ck oil and coolant level.
Make sure you have a tank of fresh premium gas.
Does the engine crank freely?

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post #14 of 16 Old 07-07-2020, 04:17 PM Thread Starter
Onelick
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The engine cranks freely.
Is there a safe way to prime the fuel pump so I don't have to drain the battery cranking the motor trying to get fuel up to the pump? or it doesn't take much to get the fuel from the tank to the pump?

Thanks for all the help,
Onelick

I should start another thread since this isn't about the engine resource list anymore.

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post #15 of 16 Old 07-07-2020, 05:53 PM
LumpyGrits
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Just let the engine crank.
It needs to buildup oil pressure anyhow.

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