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[fiend61]

namely cross contamination of fluids, exhaust gasses in the coolant system, and loss of compression causing misfires

hmmm ok-----not a lot then 

well that should solve op's misfire thread 

[Ken T]

Surely the last 90deg is not doing a lot, just torquing up for 40,000 miles, the head should have sealed by now, its allowing for the gasket to compress with time, elasticity in the bolts and all that. I would not like to waste all the effort so far, so would  ( probably ) tighten up the bolts the final 90 deg and go for it.

Ken

[JamesV6CDX]

Surely the last 90deg is not doing a lot, just torquing up for 40,000 miles, the head should have sealed by now, its allowing for the gasket to compress with time, elasticity in the bolts and all that. I would not like to waste all the effort so far, so would  ( probably ) tighten up the bolts the final 90 deg and go for it.

Ken

If it were mine, I'd do exactly that....

But, I'd feel bad advising the guy to strip off his cambelt, take the cams out, and tighten the bolts, when, having done that, he's practically at the stage of popping it off and changing the HG anyway.. 

[Ken T]

I think we are both thinking approx the same way its just the delay and cost in sourcing a new gasket and bolts may upset his plans. Hey I get impatient some times......

Ken

[Ken T]

I forgot to mention, its easy to do on a Desmond 

ken

[Kevin Wood]

The bolts will be fine as they likely won't have been tightened beyond their elastic limit yet, so no need to replace them IMHO.

As to the head gasket, I'd say it would probably have failed catastrophically by now if the clamping force on it was not sufficient. If the car hasn't been driven yet due to other problems then that makes it less likely to have failed as if the engine has not been used under load cylinder pressures will have been low.

Simple way to check, though. Measure the compression.

If we're certain that they were tightened consistently in the right order, but just 90 degrees too little, I would wind on another 90 degrees, in the correct tightening order, and hope for the best, TBH. Otherwise, I'd slacken all bolts in the correct order, then perform the whole sequence again, in the correct order.

[gibby]

Just re read this.

We need to clarify whether or not the car has been driven.

If it's been started / ran / driven on a HG that's not been torqued through all the stages, then that MAY cause issues.

If it's not even been used, then no worries, tighten through another 90 deg, and job's a goodun

Hello boss,  then thus fine because I just started it and run the engine just less than ten minutes and switched off without driving an inch. thax for that advice.