Basic Tech question

[wrenchin 4 fun]

Does anyone know the size of the exhaust studs for a Huasheng 142F?

 

[DieselTech]

Does anyone know the size of the exhaust studs for a Huasheng 142F?

5mm

 

[DieselTech]

I removed the 5mm exhaust studs & tapped them to 6mm x1.0mm pitch. Done the same thing on the intake as well.

 

[wrenchin 4 fun]

Thanks DT. Is there enough metal, the aluminum in these engines is so soft.

 

[DieselTech]

Thanks DT. Is there enough metal, the aluminum in these engines is so soft.

I got a true huasheng 142f & I havent had a issue with removing the old 5mm stud, then get a 6mmx1.0mm starting/taper tap & tap/thread the bolt hole. Go slow & blow the hole out about every 1/4 to a 1/2 a turn of the tap. Works good, & no need for any drilling.

 

[DieselTech]

I bought 6mmx1.0mm 12.9 hardened allen bolts, 100mm long fully threaded. Then I cut the head off of the bolt & used them as studs. Plus being that Long you can cut them whatever length you need.

 

[wrenchin 4 fun]

Very smart. Better to wrench on tempered steel than the cheap pot metal studs. Do you Loctite them? My red Loctite never comes loose, at least not so far.

 

[DieselTech]

Very smart. Better to wrench on tempered steel than the cheap pot metal studs. Do you Loctite them? My red Loctite never comes loose, at least not so far.

I would not use red loctite on aluminum, unless you never want it to come apart, Or it will pull every thread out of the aluminum when you remove the stud. I use blue loctite #243 pretty much on everything.

 

[Wrench]

Actually Metric 8.8 is better because the studs need a little thermal expansion

Look at any Metric M/C head bolt's or studs their not 12.9 their 8.8 , they do that for a reason Thermal Expansion of the studs & bolts

The case, cyl, and head metals expand and contract, so bolt or stud has to do the same, 8.8 is not too hard and not too soft