TD42 Blowen Heagasket

[Paul s]

Hi everyone, has anyone had other issues with a blowen headgasket on TD42, mine appears to have stuffed the piston rings also, just wondering if anyone else has had this problem, cheers Paul s

[mudski]

Id say those two things might not be related. I can't see how a blown head gasket would stuff the piston rings. Unless the gasket allowed coolant into the cylinder when then this stuffed the rings....But im no mechanic.

[Paul s]

I thanks for your reply, motors been very hot it had 7 thou warp no cracks, I've had the head machined valves lapped, new head gasket new headbolts, rocker clearances set to 14 thou, very hard to start now runs very rough, lots of smoke, and seems to be pressurizing the oil, compression tested, and all cylinders well down best 150 psi, all others below 100 psi, don't see any other choice but to remove the head and remove the pistons? cheers paul

[mudnut]

Get an oil can with a long flexible hose and small nozzle. Do a compression test. Remove the test gauge and squirt a smidgen of engine oil into the cylinder.(Not more than a spoonful of oil as you don't want to hydrolock the engine) Turn over the engine a few times to spread the oil.
Now do another compression check. If the reading significantly increases, then it indicates worn rings.

[mudski]

I thanks for your reply, motors been very hot it had 7 thou warp no cracks, I've had the head machined valves lapped, new head gasket new headbolts, rocker clearances set to 14 thou, very hard to start now runs very rough, lots of smoke, and seems to be pressurizing the oil, compression tested, and all cylinders well down best 150 psi, all others below 100 psi, don't see any other choice but to remove the head and remove the pistons? cheers paul

Theres your answer. low compression will tend to pressurise the sump