5.3 swap coolant in oil
05-10-2013, 09:18 PM
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5.3 swap coolant in oil currently working on 2006 5.3l swap into a jeep and currently runs ok but noticed dripping oil out drain plug. Opened plug to find watered down coffee looking oil. Was thinking intake gasket but took intake off to realize there is no coolant passage through a 5.3 so unlikely the problem. Decided to continue to head gaskets assuming that was next but did not see any passages in head gasket burned through so not sure what is left? Do I have a cracked block? motor has 100k miles and was from wrecked tahoe in salvage yard and I never ran enough to overheat. Is there another way coolant can get into oil? Hoping I did not buy a motor with Cracked block?
05-10-2013, 09:32 PM
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I ve boosted many ls's......and seen hundereds....and never seen a blown head gasket...I hope it is, but if its from a wreck....I d be afraid of a crack over the head gasket.
05-11-2013, 10:09 AM
#3
I just had a similar issue, but with coolant dripping out the exhaust instead of oil. Had the heads resurfaced, installed new gaskets and that fixed the issue.
The guy at the machine shop said the multi layer head gaskets make them virtually impossible to read. He also said some of the early heads had casting problems. Not sure if a 2006 falls into that category.
Take the heads to a competent machine shop and have them both pressure test them (check for cracks) and check for flatness. The machine shop guy said my heads were 0.002 warped from top to bottom. that didn't seem like enough to be a problem, but can't argue with results.
Not sure what to tell you about a potential cracked block. If you have any kinda warranty from the yard see if they will give you a new short block.
The guy at the machine shop said the multi layer head gaskets make them virtually impossible to read. He also said some of the early heads had casting problems. Not sure if a 2006 falls into that category.
Take the heads to a competent machine shop and have them both pressure test them (check for cracks) and check for flatness. The machine shop guy said my heads were 0.002 warped from top to bottom. that didn't seem like enough to be a problem, but can't argue with results.
Not sure what to tell you about a potential cracked block. If you have any kinda warranty from the yard see if they will give you a new short block.
05-11-2013, 07:50 PM
#6
I would have just changed the oil and ran it and see how it looked in 100 miles. A lot of these junk yard motors sit out in the weather and sometime the oil cap is missing or the valve cover was cracked, or even cracked intake manifolds.
I have also seen junk yard motors that had small fires and the fire dept. flood them with water and water gets in from a melted intake manifold. Most cars are front collisions so that opens up a bunch of possibilities for water getting in. Also a lot of motors sit outside in cars with the hood open, usually for months while the vehicle makes it way through the auction and then junk yard then to the end user.
I have also seen junk yard motors that had small fires and the fire dept. flood them with water and water gets in from a melted intake manifold. Most cars are front collisions so that opens up a bunch of possibilities for water getting in. Also a lot of motors sit outside in cars with the hood open, usually for months while the vehicle makes it way through the auction and then junk yard then to the end user.
05-11-2013, 08:09 PM
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I would have just changed the oil and ran it and see how it looked in 100 miles. A lot of these junk yard motors sit out in the weather and sometime the oil cap is missing or the valve cover was cracked, or even cracked intake manifolds.
I have also seen junk yard motors that had small fires and the fire dept. flood them with water and water gets in from a melted intake manifold. Most cars are front collisions so that opens up a bunch of possibilities for water getting in. Also a lot of motors sit outside in cars with the hood open, usually for months while the vehicle makes it way through the auction and then junk yard then to the end user.
I have also seen junk yard motors that had small fires and the fire dept. flood them with water and water gets in from a melted intake manifold. Most cars are front collisions so that opens up a bunch of possibilities for water getting in. Also a lot of motors sit outside in cars with the hood open, usually for months while the vehicle makes it way through the auction and then junk yard then to the end user.
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05-11-2013, 08:33 PM
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not overly familiar with the castech problem but would running the engine 6-10 times at 5 minutes max (at idle) have leaked enough to be noticable?
Last edited by rkcbvw; 05-11-2013 at 08:35 PM. Reason: new post that gave more info
05-12-2013, 12:30 AM
#11
05-13-2013, 04:29 AM
#16
if you already have the heads off I would take them to a machine shop have checked first before you throw away money on head bolts and gaskets. Also, I rhink you need to pull the rockers off to see the Castech logo, its under the rail.
Last edited by ls1nova71; 05-13-2013 at 04:41 AM.
05-13-2013, 05:05 AM
#17
Bolts and gaskets aint exactly cheap. Neither is a spun bearing.
05-13-2013, 05:27 PM
#19