February 21, 2018

How to correct a machining error in oem Harley Davidson head bolt thread drill too deep

Hi to all

Sometimes manufacturers make maching mistakes and it take a while sometimes to found the issue,and many often left facory like that and sometimes even worst,quality control was almost non existent in the past,often today .

Here it is ,you can barely see a black spot in the bottom of the thread(holes going throught drain hole cavity),the hole was drill too deep from factory and oil coming to drain to the bottom of the cylinders was sligthly leaking the head bolt thread all the way to head gasket,and into combustion chamber,so this is what I did to correct the problem.




screw from a bolts cut,blast,screew driver slot,Loctite primer then ,high temperature Red Loctite with a Q-tip at the bottom of threaded hole,screw in place,I did not need to cut the head bolts the remaining thread was a little bit more than the protruding length of head bolt



clean the thread with the correct tap,then counterbore ,and surfacing heads,





the only thing left on this head to do is to touch the seat with a 3 angles valve job,



Hope you have enjoy this thread,saddlebagrail

Filed under Engine & Transmission, Motorcycles, Other, Random Ideas, Resources, Restoration, Saddlebagrail's blog, Tech by saddlebagrail

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February 7, 2018

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Filed under Random Ideas by Buzz_Kanter

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January 17, 2018

Tappet rollers from China? They are junk

Hi to all

For those who are following my new thread about the S&S case not perpendicular to main axis

I found bunch of stuff wrong in this engine and one of them is the tappet rollers taht were installed 2500 miles ago by my friend ,he give me the ok to change anything that I could suspect was wrong,

He was much afraid of the tappet rollers bearings at first and sure I will take care of the rollers bearing (he did loose a bearing rollers and that made a huge mess inside the engine on a friend’s bike)

so here is the pictures of the unit and the new bearings.



time to take of the old bearings by drilling the pins out


More on Tappet rollers from China? They are junk

Filed under Random Ideas by saddlebagrail

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