Not too bad to replace the HG, as long as neither the block nor head is warped. Overheat is the leading cause of HG failure.

 

simple.

 

On larger engines such as V8's and such, they hae more volume between the TB and the intake valves of all the cylinders, and running a compression test closed TB dosn't skew the results 'as much'. Still, I would always do it TB open. Most recomend putting the battery on a charger while doing it so when you get to the last cylinders to check, your motor is turning over just as fast as it did on the first cylinders you tested. I always do this when testing V8's, cause by the time I get to the last cylinders, the battery is usually half dead.

 

For any that care, I have not had any time over the last 2 days to do work on the car. I'm headed to Texas for 5 days on Wed, so hopefully I can knock out another compression test and do a leakdown test prior to leaving... I'll kick off a new thread when I know more.

-Sam

 

If you're gonna be in that E-2, I'll keep an eye open to see if you fly overhead into Kelly Field...the approach path is right over the building in which I work...F-16s are cool, C-5s are too freakin' noisy!

If you do pull the head or swap rods, spend a few bucks to ensure your torque wrench is in spec. If it's good enough for the the A&P mechanic torquing the propellors on your plane, it's good enough for your car. I was unpleasantly surprised when I discovered my 1/2" drive torque wrench was 15% out of spec *low*. Instead of 80 lb-ft, I was only getting 68 lb-ft of torque.

FWIW,
Barry

 

funny, i was considering sending my wrench in the be speced since it's not in use over the winter....I hear you should do it once a year, and a HG that fails within 20 miles says a lot.