I bought a 2001 Challenger with the Mercury M2 240 EFI. The engine was bad when I bought it and cylinder #3 is bad.
I removed the piston and the cylinder wall does not appear to be too bad. You can see the marks on the wall but can barely feel anything with your fingernail. You can feel the ridges with the tip of your finger. The manual states that the finish hone should measure 3.501 in (88.93 mm). My cylinders measure as follows.
Cylinder #1 measures 3.497 in or 88.84 mm
Cylinder #3 measures 3.502 in or 88.94 mm
Cylinder #5 measures 3.498 in or 88.85 mm
The manual shows there is an .015 in (.381mm) oversize piston so the finish hone should be 3.516 in (89.31 mm).
Can someone tell me where I can find an oversize piston? I would prefer .030 just in case I need to bore out larger. Also, any ideas what may have caused this in the first place. I would hate to fix it without finding the cause.
Need Oversize Piston for M2 240 EFI
Started by yama0918, Oct 14 2011 11:49 AM
1 reply to this topic
Posted 14 October 2011 - 11:49 AM
Posted 21 November 2011 - 06:46 PM
Usually fuel or oil. If you have an oil injection system I check out all the lines and check carb\fuel system or something broke off in the cylinder. That looks like a fuel issue.
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