Milled head torque specs

Midlake Crisis

Midlake Crisis

Site Supporter
Location
Bakersfield, CA
I have a stock 701 head that has been milled and set up to use O rings.
Compression is 170ish.
I rebuilt the topend at the beginning of the season and it has been running great (in fresh water!) but Thursday my ride ended about a 1/2 hour short with sputtering pissers from a burned out O ring.
I got some new viton O-rings but am wondering;
Should I increase the torque on the head over stock specs because of the increased compression from the milled head??
 
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Freakrider

Freakrider

X247
Location
Tampa Bay area
What are going with now 22 torque on the head ? sometimes permatex ultra black hi temp sealant or 1211 can help....pro tec uses the ultra black...what sealant are you using on that stock head any ? ADA head works w/ just grease to hold o-rings in place during assembly...fyi ADA seals with a torque of only 18...
 
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wydopen

wydopen

onthepipe
Location
Goleta the Goodland
i had been running the same orings in my ada head for a year (the life of the motor) and one finally blew..we fixed it by making a gasket on the beach and that lasted almost a whole day and then it blew again..i got new orings and replaced them..i didnt have a torque wrench either time (my buddy torqued them the first time) and the second time i torqued them pretty tight..it felt like more than 18lbs to me..anyways i was halfway to my riding spot and my ski stopped running..i thought my motor blew so i ended up swimming my ski for an hour and a half back to the launch spot while my buddy shredded perfect waves...well it turns out my head came loose and thats why i lost all compression..i put some grease on the girdle studs and they didnt have any on it before..im assuming thats why they came loose as im pretty sure they had more than 18lbs of torque on them..as far as the orings blowing thats kind of a mystery..like i said i had never blown one before..the motor didnt get hot..sleave didnt drop..so either it was just old or my head is cracked or something..so if it does it again ill use my back up ada head and see if that solves it...so basically its 18lbs on the allen heads and 22 on the acorn nuts???

sorry for the thread jack...
 
#ZERO

#ZERO

Beach Bum
Location
Florida - U.S.A.
oxnard111 said:
i've never heard of a stock head being converted to use o rings...

are the rings just around the domes? do you have to use a gasket also? got pics?
Click to expand...

It makes the compression higher with no gasket; you just have to use permatex ultra black sealant around the water jacket area.

Here's a picture of the pro-tec head with the same set-up.

Cast_Heads.gif
 
Freakrider

Freakrider

X247
Location
Tampa Bay area
wydopen said:
i had been running the same orings in my ada head for a year (the life of the motor) and one finally blew..we fixed it by making a gasket on the beach and that lasted almost a whole day and then it blew again..i got new orings and replaced them..i didnt have a torque wrench either time (my buddy torqued them the first time) and the second time i torqued them pretty tight..it felt like more than 18lbs to me..anyways i was halfway to my riding spot and my ski stopped running..i thought my motor blew so i ended up swimming my ski for an hour and a half back to the launch spot while my buddy shredded perfect waves...well it turns out my head came loose and thats why i lost all compression..i put some grease on the girdle studs and they didnt have any on it before..im assuming thats why they came loose as im pretty sure they had more than 18lbs of torque on them..as far as the orings blowing thats kind of a mystery..like i said i had never blown one before..the motor didnt get hot..sleave didnt drop..so either it was just old or my head is cracked or something..so if it does it again ill use my back up ada head and see if that solves it...so basically its 18lbs on the allen heads and 22 on the acorn nuts???

sorry for the thread jack...
Click to expand...
ADA calls for 18/23...I go with 20/25 and use anti-seize on studs in the case only like they suggest...
 
Kaveman

Kaveman

Born in USA(not Kenya)
Location
texas but soon tejas
Put a piece of NEW 400 grit sand paper on a KNOWN straight flat surface roughly 3-4 x the size of the head mating surface. Lay the head down on the paper and lightly work in a figure "8" pattern a few times. Lift the head and observe the area on the head that has been sanded by the paper.If the entire head mating surface is sanded then you're good to go. If you have areas that are absolutely free of any sanding then you have some concern as to the straightness of the head surface.

Note the head must be completely clean of ANY gasket material, silicone and dirt and grease before checking.
 
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Midlake Crisis

Midlake Crisis

Site Supporter
Location
Bakersfield, CA
UPDATED

Last time I posted in this thread I ended up using a thin layer of Threebond 1194 on all the mating surfaces of the head, along with the O-Rings. I got quite a few hours of service out of it but this Thursday it felt like I was starting to lose compression toward the end of the ride and I noticed the familiar sputtering out of one of the pissers.
I just tore it down and buttoned it up again with new O-Rings, this time using the Permatex Ultra Black. Hoping for a little more service out of it this time, we shall see.
 
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