GY6 150 head stud placement

[usmcdoc]

Having a lil GY6 150 head stud placement confusion. Due to limited space cause I did not want to remove my engine....I had to remove the head studs to remove head and cylinder. Tried to keep parts in order but somebody moved scoot in my work shop. Not all the studs are the same length...so I am wondering if someone has a diagram ...or can tell me where each one goes? :doh:

[90GTVert]

I'm not sure. In the event that no one else is completely sure, I'd suggest mocking it up. Perhaps there will be an obvious reason once you put the cyl/head/rocker assembly in place?

[Deleted]

Jan 18, 2012 13:41:57 GMT -5 90GTVert said:

I'd suggest mocking it up.

same here

[Fox]

I think maybe two holes in the engine are deeper than the other two so they can accommodate a longer stud. Maybe...?

[Goosey]

The bolts closest to the CVT side are longer. The end with the shorter solid part by the threads goes into the engine.

[usmcdoc]

Goosey....Aha!....remembering that now...now sure why it is....as either will fit anywhere....but they must do it like that for a reason. I think it isbecause the hollow dowel alignment pins on the other side also act to regulate oil flow the head.....since oil passes through the center of them restricting it flow.....due to the longer shoulder at the base of those bolts..maybe that is why once some body gets into their top end...and re assembles it....they end up with a massive oil blow by from the valve cover vent...... :stumped:

[Goosey]

It's all in the details I take a lot of pictures and use masking tape and markers to make sure I put things back the way I find them.

[vvtr]

simple rule of thumb with different size studs... same as on the casings, drop them in the holes without screwing them in - they should all stick out the same amount - about 15mm (5/8")