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Old 09-03-2017, 08:19 AM   #16
Capt Kirk
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Join Date: May 2015
Location: Clarkston MI
Posts: 830
Default Re: Flat 6 just developed a good knock

Quote:
Originally Posted by edhd58 View Post
Capt Kirk, if its piston slap its still a tear down, right? And wont piston slap ruin a cylinder if not treated fairly soon?
As for oil pressure its when warm 20 at idle and 40 to 50 running down the road.
That oil pressure seems pretty good to me. If you want to know for sure, you can pull the head and check the #5 piston. In my cases (one was with my daughters jeep) with piston slap, once the head was off, I was able to move the piston around with my thumbs...the one with the broken skirt, I was able to rock a bit. My daughter must have drove 8-9 months with it clattering around when cold till she could afford the parts for me to rebuild for her.
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