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Unread 01-20-2015, 08:03 PM   #1
BigPheJeep
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Testing a 4.2 258 on Engine Hoist

What is the best way to test a 4.2 on any engine hoist? I have one I pulled from CJ7. The previous owner said it ran and drove when he parked it a year or so ago. It was frozen up but after pulling the plugs and putting some WD40 and then oil down the cylinders I moving the crank back and forth i can get it to spin freely. Is seems to turn over smoothly now.

It still has the carb attached. I have the starter too. Can I put the starter on it without the transmission and turn it over? Would a leak down test be better? I just want to sell it and make sure that I am not selling a burnt up engine to someone. The po said the CJ7 had 128,000 miles on it and that is what the odometer had on it. Thanks for all the help!

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Unread 01-20-2015, 11:24 PM   #2
CrashOdle
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I am in the same boat lol. I would love to know if you pull this off. I've often considered it myself.
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Unread 01-20-2015, 11:39 PM   #3
BagusJeep
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You can turn it over with the starter on a hoist but you will need the bell housing to hold the starter to the flywheel.

If you take out all the spark plugs it will spin easily and quite fast with little resistance for the starter. A compression check just requires the tester be screwed into the hole. The starter can then be turned with a battery and a set of jump leads for the few revolutions you need to measure each cylinder.

Starting it whilst on the hoist would not be advisable.

If you cannot get a bellhousing you are stuck for using the starter but you COULD (and this is just an idea) put a lever or brace on the crankshaft pulley and try to turn it fast enough to get a reasonable measure of compression on one cylinder. Sounds easier than it might be in practice and I have never seen it attempted but this is basically how cars used to be started.
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Unread 01-21-2015, 06:47 AM   #4
Mike Romain
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Plugs out, compression tester inserted and impact gun on the front crank bolt comes to mind.
If the engine was seized, that implies bad things for the condition of the rings. It might make a good core for a rebuild. A compression test tells lots.
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Unread 01-21-2015, 06:56 AM   #5
CurtG
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Do not attempt to start a engine on a engine hoist....really bad things will happen.

Do what one poster said take plugs out and rotate at the crankshaft pulley. You best bet is take the head off and inspect, your almost there anyway. Suggest you think about a overhaul of the engine and full inspection of components. Any jeep engine that has sat for log periods and is seized in anyway need to be fully inspected.

Think about how much work you will SAVE yourself when you just overhaul it now and put it back in KNOWING its done and reliable going forward.

Lastly the 258 is really cheap to overhaul, you can get a long block done for 1400-1700 bucks. Do it yourself for 800 (machine shop work for block and heads is the only wild card)

Good luck
Curt
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Unread 01-21-2015, 07:36 AM   #6
BigPheJeep
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Thanks for all the advice guys. The engine wouldn't turn over with the plugs out and turning the crankshaft bolt at first. I sprayed some WD40 down the plug holes and then some poured a little 10/30 afterwards. A little wiggling back and forth on the crank bolt and it spins freely now. I guess it was just stuck from sitting outside for a year or so. I do have an impact wrench but am afraid that it could break the bolt off. I guess having someone bring a bellhousing and starter would be the only way to test.

This is just a parts engine I have and don't need it for my CJ. I just want to test it so I can sell it with confidence. I'm only going to ask $200 for it as I don't know the history and have never heard it run. Seems like more than fair price with both manifolds, carb, distributor and fly wheel. What do you guys think?
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Unread 01-21-2015, 07:59 AM   #7
Matt1981CJ7
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You could do a cylinder leak down test. It will tell you more than a compression check, anyway, and you won't need to fire up the starter.

All you'd need is a compressor, hose, and a cylinder leakage tester.

As for price, I think $200 is more than fair, probably a little cheap. I sold my well-running 258, that was complete from fan to flywheel, for $850.

Matt
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Unread 01-21-2015, 08:06 AM   #8
BigPheJeep
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Quote:
Originally Posted by Matt1981CJ7 View Post
You could do a cylinder leak down test. It will tell you more than a compression check, anyway, and you won't need to fire up the starter.

All you'd need is a compressor, hose, and a cylinder leakage tester.

As for price, I think $200 is more than fair, probably a little cheap. I sold my well-running 258, that was complete from fan to flywheel, for $850.

Matt
I do have an air compressor. Can you rent leak down testers at Autozone? That sounds like the thing to do. Any suggestions on a cheap one to purchase? Thanks Matt!
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Unread 01-21-2015, 08:15 AM   #9
Matt1981CJ7
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I got my leakage tester from NAPA, but it was a little pricey.

http://www.napaonline.com/Catalog/Ca...LT2_0132282041

I've seen other models as cheap as $46 on Amazon. I had no luck finding a rental.

Matt
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Unread 01-21-2015, 10:40 AM   #10
BigPheJeep
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Do you need a separate piece that threads into the spark plug?
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Unread 01-22-2015, 06:13 AM   #11
Matt1981CJ7
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That will come with the tester.

Matt
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Unread 01-22-2015, 07:35 AM   #12
BigPheJeep
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Quote:
Originally Posted by Matt1981CJ7 View Post
That will come with the tester.

Matt
Thanks Matt. I may pick one up if I have another parts motor.

Someone came over last night and picked up the motor I had. He got a great deal and I got some cash and clear garage floor. I may be kicking myself if I need it down the road but I'd rather have an engine I've heard running.
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