Let's Trouble Shoot this 360! - Page 5 - JeepForum.com
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post #61 of 136 Old 08-28-2019, 06:45 AM
Matt1981CJ7
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Whoever "opened and inspected" this engine needs to find a different line of work.

Time for a full rebuild. Sorry for your bad luck.

Matt



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post #62 of 136 Old 08-28-2019, 07:58 AM
Fourtrail
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I would start by pulling the valve covers and check out the 'new' valve seals, that looks like it is seeping a ton of oil into the combustion chamber. while the covers are off, I would re-torque the head bolts, couple of free things to check before pulling the motor and sending it for a full rebuild.
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post #63 of 136 Old 08-28-2019, 08:40 AM Thread Starter
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Thanks guys. I'll start with the valve covers today.

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post #64 of 136 Old 08-28-2019, 10:52 AM Thread Starter
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Valves off
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post #65 of 136 Old 08-28-2019, 11:23 AM Thread Starter
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Not really sure what all I should be looking for. I’m quite the novice here.

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post #66 of 136 Old 08-28-2019, 11:45 AM
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The valve seals are on the valve stems inside the valve springs. To check them properly you'll need to remove the rocker arms, then remove the springs. The springs require a special tool to remove. Honestly, I don't think it's worth the effort to remove the springs, unless you plan to tear down the whole engine, yourself. It's not likely the valve seals are causing your low compression, anyway.

I'd check the torque on the head bolts. If you don't find any that are unusually loose, then the low compression is either worn piston rings and/or carbon buildup around the valve seats. Either way, a complete rebuild is the fix.

Matt
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post #67 of 136 Old 08-28-2019, 12:03 PM Thread Starter
garet.friedrich
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Could it possibly be the cam shaft? Or lifters?
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post #68 of 136 Old 08-28-2019, 12:04 PM
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Glad you posted, always good to have different eyes, thoughts and suggestions on things. Head bolt tightness is an easy thing to check- there is a specific pattern in tightening head bolts, be sure to follow that when you go through that process. And from your initial images, can see what mean by the spark plugs being scorched/'carbon-ized' just below the boot. That would indicate a leaking exhaust manifold as well.

Hate to echo all the thoughts above, but if nothing is overtly loose, going through a full rebuild will be the only way to regain confidence in this engine.

Hoover
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post #69 of 136 Old 08-28-2019, 12:26 PM Thread Starter
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What should I inspect now that the intake manifold is off? Some coolant noticeable.
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post #70 of 136 Old 08-28-2019, 02:01 PM
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Heck, you're in this deep, you might as well pull the heads and have a look at the combustion chambers and valve seats.

The compression test basically measures how air tight the combustion chambers are. There are really only a few things that will cause low compression in all cylinders...worn rings, worn bores, and/or carbon crusted valve seats that don't allow the valves to close as they should, or some combination of all 3.

Matt
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post #71 of 136 Old 08-28-2019, 02:11 PM
pedal2themetai
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HI Yeah the cam does nothing for compression.. I'm with Matt Pull the heads, Rings or valves bad, check the head bolts before pulling the heads to make sure they are tight.. even if they are or are not pull them .. as running the motor with lose bolts well ruin the gaskets anyway..
You'll have to pull the heads to look at the valve or in worse case pull the piston's anyway for rings.. OH don't know if you have to pull the motor to get the pan off?
good luck
tim
PS it actually looks purity clean inside.
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post #72 of 136 Old 08-28-2019, 03:46 PM
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Coolant in the valley is normal after popping the intake off as there is still coolant in the intake even after draining everything down. Was there a valley pan under the intake or just gaskets between the intake and heads?
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post #73 of 136 Old 08-28-2019, 03:57 PM Thread Starter
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There was a valley pan yes.
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post #74 of 136 Old 08-28-2019, 05:04 PM
pedal2themetai
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FYI theirs going to be coolant in the pan as well so be sure and change out the oil before re-starting it.
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post #75 of 136 Old 08-28-2019, 05:19 PM Thread Starter
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Oil has been drained. I plan to pull the heads in the next couple of days.

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