New cylinder heads


jklolkik

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I am in the process of installing new heads. Thats on hold for now as 1 of the bolts holding the rocker arm assembly to the head broke.

I noticed 2 of my lifters have the center plastic cap broken off. They are for different cylinders and those pistons show signs of burning hot. Also the spark plugs are blistered.

Would this be a sign of bad lifters?

93 ford ranger rwd
 
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Uncle Gump

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You should probably start by telling us why you are installing new cylinder heads...
 

jklolkik

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There was a pretty bad misfire and I was able to see a small crack between valves on the passenger side rear cylinder
 

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Since when do rocker arms attach to the block? If you've got new heads how did the rocker shaft bolt break? If im reading this right it sounds like your engine over heated and cracked the head. Why did it over heat? I'm very confused. Some pictures may help.
 

jklolkik

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When i get home i will take pictures.
That was a typo it was supposed to be to the cylinder head.
The bolt broke when torquing it down. Probably only got to 20 ft lbs then broke. Looks like it was an old crack where the bolt broke.
 

jklolkik

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Here are the pictures of the heads and the cylinders in question
20190703_210712.jpg

20190703_210649.jpg

20190703_210637.jpg

20190703_210703.jpg
 

Dirtman

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Gross... looks like it was running lean, overheated and burning oil all at the same time. Did you do any wet dry compression testing before taking the heads off? How do the cylinders and pistons look? How many miles are on this thing?
 

jklolkik

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the cylinders look good the pistons on those 2 cylinders have heavy carbon. except for the very far side toward the fender it was clean bare metal on the piston. Did not do a compression test. Probably should have but with that side having a crack I didnt even think about the compression. miles no idea but for its age and its exchanged hands a couple times im guessing either close to 200k or over.

The coolant passages on the head gasket were heavily rusted. Going to flush it once i get it running again. Ideally I would take it out and fully tear it down and get it hot bathed, but dont have the time or space for that.
 

Dirtman

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Would have been more logical to get a new engine. Goood luck.
 


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