[LCML] White smoke in exhaust
nkt at landcruiserspecialties.com
Thu Mar 29 11:41:31 CDT 2012
It's not uncommon to have cracked exhaust valve seats or worn out exhaust valves, since these are the areas that receive the most heat. I doubt the failed head gasket was the sole cause for the cracked seat. I'd recommend replacing the seat (along with the rest of the head job) and moving forward.
15055 S. Loder Rd. A2
Oregon City, Or. 97045
On Mar 29, 2012, at 8:14 AM, William Sampson wrote:
> Well, the saga continues. The machine shop found a crack in the #4 exhaust valve seat. They say they can repair it by counterboring and installing a new seat. The worrisome thing to me is that excess heat is cited as the reason for the crack, yet the engine never overheated. I have both the stock temperature gauge and an aftermarket unit installed and neither went past 190 degrees. Once I detected the white smoke in the exhaust, I drove it less than two miles home, watching the gauges all the way. What gives? Could a failed head gasket cause localized overheating that wouldn't show up on the temperature gauges? I have a lot of confidence in the machine shop guy. He's been in business forever, has done great work for me before, and comes highly recommended by everybody I talk to.
> Will Sampson
> TLCA #16929
> 1972 FJ55
> 1968 M101-A1 military trailer
> LCML mailing list
> LCML at tlca.org
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