Headgasket

[CToney]

What is the part # for the headgasket on a first gen. It is a 1993 5sp w/ HO injectors and a 16cm housing. I've done the headgasket on my '97 before so this one should be easier, I hope. Is there anything a guy has to watch out for?



Thanks for the help



CR Toney

 

[Joseph Donnelly]

It is superceded by the better marine gasket, 3283335. Get the surfaces super clean, scraped three times with a razor knife, lacquer thinner. Torque the head bolts in proper sequence 40-60-80-100-115 or 120, check again for 115+ with engine oil on the theads and shoulders. Mop out the head bolt holes in the block first so you don't squirt oil and antifreeze onto the deck when installing the bolts.

 

[glhs]

Joe, with the marine gasket, does the compression ratio remain the same?

 

[dpuckett]

If it is the same thickness, yes it does. Marine refers to grade, not thickness. Now, if you go . 010 or . 020 over, you will lower your compression ratio. 3283335 is stock; 3283337 is . 010 over; 3283339 is . 020 over. I'm not sure what the . 090 over is that Scheid's advertises on their site, unless it is metric



Daniel

 

[RGramlow]

I need to put a head gasket in my service truck conversion, engine is out of a 93 250, why would you want to put in a thinker head gasket?

 

[cerberusiam]

I need to put a head gasket in my service truck conversion, engine is out of a 93 250, why would you want to put in a thinker head gasket?

Think cylinder pressures... .....

 

[RGramlow]

I understand that there will be less pressure, but are you guys doing this to run more advanced timing, or more boost, or both? Without either wouldn't it make less performance with lower compression ratio?

 

[dpuckett]

Actually, when loweing compression ratio, one should increase fuelling and drastically increase airflow. The extra airflow and increased efficiency with more fuel/ bigger injectors will overcome the loss of compression. Go to Diesel Injection - Where the Strong Ones Come From and read up on the building of a 6-800hp 14 or 19 liter engine (Bruce's Horsepower and torque articles). The same principles apply to the 5. 9s, and turbo diesel engines in general.



I went with a . 020 over gasket, and bumped my timing about . 1mm. Not so much to compensate for the lower compression (~17:1 vs stock 17. 5:1, IIRC) as much for the higher pop pressure of the injectors, as the local shop set them to 3800psi instead of the stock 3550psi.



DP