H-11 Install

caladash · May 3, 2013

Getting ready to install some H-11 studs in my spare motor. The enclosed directions recommend using a bottoming tap or a thread chaser to clean the threads in the block up. Does anyone know what size to get and where to buy it from? Now is this to ensure the threads aren't thrashed or just to clean the holes up? Would some brake clean and air be sufficient? Last one, is the final torque of 125 foot pounds the appropriate final torque? Gonna double check in the International service manual but I don't know if there are other opinions considering these are studs and not bolts.

JDub · May 3, 2013

I'd suggest running the tap. Want the threads to be clean and the bottom of the holes clean so the stud actually bottoms out. 125 should be your final torque number.

Sent from my XT907

caladash · May 3, 2013

What size tap or thread chaser do I get?

chris89 · May 3, 2013

12mmx1.75 is what summit racing says.

caladash · May 3, 2013

So I know these thread chasers exist! Does anyone have a link or know where to get one? All I'm finding are rethreading taps.

TyCorr · May 3, 2013

Sounds like the same size as.those inexpensive sparkplug hole chasers. Use some.cutting oil or.engine oil.and a chaser at least. If you know.what you're doing then run a tap.in there. You have to know how to.get.the shoulders of the tap lined up or you'll ***k the threads up.

Tread lightly!

caladash · May 4, 2013

I'm not comfy with the tap. Especially not really being able to see in there. I'd feel happy just chasing them but cant find one.

907DAVE · May 4, 2013

Grab a old head bolt and a die grinder and make your own.

caladash · May 4, 2013

907DAVE said:
Grab a old head bolt and a die grinder and make your own.

I have two engines worth of old head bolts! What am I doing to the bolt? Heads are off of the motor I'm building.

907DAVE · May 4, 2013

Google image thread chaser, you'll see.

old man dave · May 4, 2013

You can get bottoming taps from McMaster-Carr. Diesel Innovations has H-11 head stud installation instructions on his website. The studs are bottomed out and torqued into the block so the threads have to be clean all of the way down.

907DAVE · May 4, 2013

old man dave said:
The studs are bottomed out and torqued into the block so the threads have to be clean all of the way down.

They really shouldn't be, unless by torqued you mean finger tight.

caladash · May 4, 2013

Im assuming just grind some flutes into it and be done with it?

caladash · May 4, 2013

The studs came with instructions and they say to just install the studs finger tight. Studs came from Swamps.

907DAVE · May 4, 2013

Yup, just some channels to cut and collect the crud.

Mine had no instructions, but never have I seen a head stud that requires you to torque it into place.

TyCorr · May 4, 2013

907DAVE said:
Yup, just some channels to cut and collect the crud.

Mine had no instructions, but never have I seen a head stud that requires you to torque it into place.

Right. Thats the exact opposite of the designed purpose.