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Top of piston is shiny

4547 Views 3 Replies 3 Participants Last post by  GTJIM (R.I.P.)
Hi All,

I thought I'd just throw this out here to see if this is something I should be concerned with.

I was putting my cylinder head back onto the block this morning. And in the process of cleaning the top of the block, I noticed that pistons 1-3 look about the same on their tops. A layer of carbon had deposited there. But on piston #4, the top is shiny. I scraped off as much of the deposits from all the piston tops as I could. The first 3 pistons were dry, like dust. But the last piston was like oily dirt.

Since I had the head redone, I hope this will fix whatever caused #4 to be different. Anyways, I thought I'd just see what you all think.

Thanks and Happy New Year,


PS. What do you use to torque the last head bolt on the driver side closest to the firewall? It's a pain to get to.
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namba209 said:
Manny, was the combustion chamber on #4 clean like the top of the piston? If so, you may have had the beginning of a coolant leak in that cylinder/head and you've been steam cleaning it while driving. Hopefully the rebuild has cured the problem.
Hi Ron,

I didn't pay attention to the combustion chambers when I took the head to Roger Wilson. But a coolant leak would explain why my cooling system was being pressurized and blowing my bottom radiator hose off.

But the top of the #4 piston was not clean. It was covered with oily deposits.

1 - 2 of 4 Posts
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