401 diesel

[Anonymous-0]

FINALLY got my 400 together. purs like a kitten. Do have a couple of questions tho. Not getting much if any smoke when I pull it. Can the fuel be turned up on an American Bosh pump and how do you do it? Second I'm getting a little leakage from the heads. Will this stop over time or did I do something wrong? What is the torque for the head studs? My book says studs should be torqued to 100 ft/lbs and bolts to 150 ft/lbs. This seems light to me.

 

[Case Nutty 1660]

did you do the retorque the heads after warming it up to operating temp for at least 15 minutes the you loose each bolt/nut one quarter turn then retorque to specs do this in the sequenice

 

[Anonymous-0]

yes I did retorque them, thats why I'm surprised its leaking. It's not much, but a few bubbles on both heads between the heads.

 

[Case Nutty 1660]

thats not good is it anti freeze thats leaking or oil ? it might be worth a try to retorque again and by the way did you lube bolts/nuts also if not you could increase torque value by 10-15%, also have you checked how accurate your wrench is by chance? just throwing out a few things, you could also try getting it up to temp andadd some Bars leak to see if it will seal if it is anti-freeze leaking, I do not recommend using another brand of stop leak good luck cnt

 

[Anonymous-0]

its just the smallest antifreese leak. it only gets wet about 1 inch down the block before it evaporates. Not much of a leak. I'll try some bars leak. What about bumping up the fuel, can it be done on these pumps?

 

[DKase]

Did you use any head gasket sealer on the gasket when you put it togather? 15 years ago I started using it on all head gaskets for that reason. I have taken to many appart that the heads were walking on the block. Several have had a inprint of the head warn 1/16" into the block. The gaskets that came with the kit for the 336 that went into my W14 leaked with sealer on them. I talked to the company that sold me the kit and they replaced the gaskets with name brand gaskets (Victor) and they sealed fine. And yes the heads were surfaced, block was surfaced, and the counterbores were cut and shimmed to specs. What brand were the head gaskets?

 

[outsidersag]

I always torque 10 lbs more than the book calls for. just did heads on a 700, torqued to 110, warmed it up and retorqued to 110,backing each one off a quarter turn first. got almost 3quarter turn more on retorque.

 

[John Saeli]

Did you re-torque as Nutty outlines? Just pulling on the torque wrench doesn't cut it.

 

[Anonymous-0]

I got the kit from my case dealer.

 

[Doc Larry]

Everyone"s made some good suggestions. I"ll add that I like to run a thread chaser in the bolt holes, nuts and studs, and lube lightly, and then torque to the specs for clean, lightly lubed threads.
We had an old Autocar with an NH250 Cummins that seeped antifreeze around the head for years with no ill effect, but I wouldn"t want to see any problems on a fresh job.

 

[Case Nutty 1660]

Doc you make a great point, I do the same always as you suggest but have mentioned it before and got flak for it glad to see someone else who goes the extra mile Thanks again cnt