Discussion:
CAT GC25K - AT82D - White Smoke -

This has a 4G63 Mitsi engine with the electronic thottle, also a catalaytic muffler. On start up it has a large amount of white smoke that comes from the exhaust..........now I know what everyone is going to say.........HEAD GASKET..........but.........the smoke is not sweet smelling the coolant levels are not going down at all and the engine runs great. I suspect condensation in the muffler but have never seen it that bad. Any thoughts would be appreciated
  • Posted 23 Feb 2011 08:17
  • By Prentice
  • joined 25 Jun'08 - 600 messages
  • Ontario, Canada
Showing items 1 - 3 of 3 results.
If the valve seals are bad the oil level should be dropping. I replaced seals on Toyota's that did the puff of smoke when started or after idling a while. You can screw a compression tester hose in the spark plug hole, pressurize it, and use a special sping tool the remove the springs to change the seals.
  • Posted 23 Feb 2011 12:52
  • By mrfixit
  • joined 11 Dec'08 - 1,434 messages
  • New York, United States
i have seen a puff of white smoke at begining of shift or after several hours beeing stoped. have found Like eduard says : bad valve seals.
Also a bunch of smoke, like a cloud comming out (oily smelling), and after "less hair at my head". i found excess of oil at rocker cover, beacause of a worn rocker shaft.
  • Posted 23 Feb 2011 12:25
  • By roldann
  • joined 3 Sep'08 - 86 messages
  • nuevo leon, Mexico
might be valve seals...
does it only happen after sitting overnight, or every time you start?
  • Posted 23 Feb 2011 08:46
  • Modified 23 Feb 2011 08:46 by poster
  • By edward_t
  • joined 5 Mar'08 - 2,334 messages
  • South Carolina, United States
"it's not rocket surgery"

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