Tech

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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December 16, 2017

American made V-Twin engine case problems,and how to correct it

Hi to everyone

I  post this tech thread about an engine that has been plain trouble since it was build a few years ago  in the States.

The engine is a mismatch Shovelhead engine with S&S case has been apart at least 2 time in the last 2000 miles,not to count the numerous time it was open for severals reasons before my friend bought the bike a few years ago from the USA,….He simply nickname the bike «Christine» for a simple reason….

We had a long talk at his place last summer about it,to start with, his background he his a very good motorcycle mechanics since way way back and we know each others for a long time, he want my input about his Shovel,he ask me to listen to «Christine»,and I did ,all I can say is the front cylinders was making an awful sounds.

The engine will need to be open again for another time, to see what is the problem again right now,he told me very seriously that if that engine get back into the frame and still have problems,it will end up as a boat anchor,and he really mean it, he is very good on all tasks around motorcycle except he never did a Harley crankshaft.

I offer to do the bottom end, and at the same time also to do the severals machining tasks, that need to be done when your doing an engine,he ask to take care of it completely to get rid of the curse,he was piss off of the engine,so I accept for him …..so here is some pics of the carnage first.

 

 

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

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November 7, 2016

Classic Harley Davidson Star hub rebuild with new type quality ball bearing

This time I will show you how to update some worn out old Harley Davidson star hub, in early wheels Harley were using some loose rollers in cage that were running into the case-hardened housing bore, to rebuild them to like new condition, they should be lap and the use of oversize rollers were need, quite a job for a regular guy to save those hubs.
I decide to modify the inner guts only to accept usual ball bearing, meaning that I will not use loose rollers anymore, all internal will be update but external look will stay exactly the same which is quite important when doing update like this.First, here is some pictures of hub and mandrel use during the process
Here you can see a real worn inner hub, inner surface should be really smooth usually when loose rollers were riding into housingSmall sleeve need to be out before the machining, you can see it against the shoulder

Star hub mount on an custom-made aluminum machining mandrel, press in place with live center from lathe tailstock. Just a light interference of .001 should do it.

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Filed under Other, Random Ideas, Resources, Saddlebagrail's blog, Tech by saddlebagrail

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