valves through piston

Posted by fixerupper on March 27, 2006 at 06:54:33 from (206.72.37.149):

I Just tore down a 3406C Cat engine that broke both exhaust valves in #1 cylinder and the piston tops are cracked in the rest of the cylinders. This engine is in a truck that the owner bought used about a year ago but the previous owner said "It has a lot of power because I turned it up and put a bigger turbo on it". Of course this sends up some red flags but I have heard exhaust valves can be broken by over-reving when downshifting with the Jake on or a malfunctioning Jake not closing the exhaust valves in time. I know a lot of you guys are truckers or truck mechanics, so what's your opinion on this? Can the cause be all of the above or is there something else going on? When this goes back together the pump will be turned down. The turbo is probably trashed from bits of valve and piston going through it. Jim

Replies:

• Re: valves through piston Mark - IN. 20:43:19 03/27/06 (0)
• Re: valves through piston CaptRon 13:02:43 03/27/06 (0)
• Re: valves through piston the tractor vet 07:57:22 03/27/06 (0)
• Re: valves through piston Bob/Ont 07:23:24 03/27/06 (1)
  • Re: valves through piston fixerupper 08:34:12 03/27/06 (0)

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