Nuts and bolts

[Val V]

I am trying to assemble back all the parts back, after the block undergone a major overhaul. When I was disassembling the engine I put most of the bolts back in their holes so I would know where they go. Well, unfortunately the machine shop that was baking and blasting all the parts removed all the bolts and misplaced them So now I have to find a lot of bolts. MM manual says what bolt width to use most of the time but not length and not thread size.

For example, What bolts do I use to put on the starter? thread seems to be 3/8 but the neck is much thicker..
What length of the 3/8 bolts do I use to put on the flywheel housing?
The flywheel cover seem to be using 1/4-20 bolts but 3/4 is too long and 1/2 i am afraid will be too short.

Is there a nomenclature of all the fasteners used on A4?

As always, Thank you for your time.

Val

[Val V]

I googled and found partial answer to my own question

http://www.cncphotoalbum.com/atomic4/partslist.pdf

still things like bolt for mounting starter does not specify details

[hanleyclifford]

The Atomic Four Repair Parts List calls for (11) 3/8"-16 x 3/4" for the flywheel housing. The flywhel cover calls for (6) 1/4"-20 x 3/4". The starter can be mounted with 3/8"-16 x 1" or 1/14". BTW, that link you posted is excellent.

[67c&ccorv]

The description of the size and length of the bolts you are trying to sort out in the parts manual may be incorrect...you should see the Norton Commando parts manual from the 1970's!

This is where a sliding caliper with a depth gauge will help out enormously...simply insert the depth gauge into the hole to determine the length of the bolt that should go in it.

Hopefully it will in most cases be a blind hole - if not you will have to estimate the depth of the threads.

When you are doing the final assembly loosely thread the bolts into the hole to determine whether they are too long or not.

This is the reason why all bolts removed should be photographed and then placed in (clearly marked with a Sharpie marker) freezer bags.

Good luck!

[hanleyclifford]

After many years of service and multiple tear downs the capscrews on my engine were getting a little ratty on top besides which it always seemed to be necessary to go to an open end on those in tight corners. So this year I switched to allen headed where ever possible and assembly was a breeze. Seems like you have an opportunity to do an upgrade too. Don't forget the copper washers (available from McMaster) where oil leaks could be an issue.

[Val V]

After many years of service and multiple tear downs the capscrews on my engine were getting a little ratty on top besides which it always seemed to be necessary to go to an open end on those in tight corners. So this year I switched to allen headed where ever possible and assembly was a breeze. Seems like you have an opportunity to do an upgrade too. Don't forget the copper washers (available from McMaster) where oil leaks could be an issue.

You absolutely right about doing the upgrade on the bolts. Although I am not sure if you can torque them as much... I just wish I would know how many and how long and what size I need so I can get it all in one shot.

Hmmm ...tell me more about this copper washers. Where do those go? Before I had locking washers on pretty much all the bolts.

[hanleyclifford]

You absolutely right about doing the upgrade on the bolts. Although I am not sure if you can torque them as much... I just wish I would know how many and how long and what size I need so I can get it all in one shot.

Hmmm ...tell me more about this copper washers. Where do those go? Before I had locking washers on pretty much all the bolts.

You can get everything you need from McMaster including the allen style sockets for 1/4" or 3/8" drive.For the oil pan I used 97725A150 metric sealing washers (copper). Other sizes are available for larger screws so you will have to go to the web page and do some research. Lockwashers should never be used on oil pans because they will leak at the split.
Oil pan calls for 5/16"-18 x7/8" but I bet you could use 1". Wherever possible on the flywheel housing I used 92196A626 but in some cases I shortened them because I wanted a more versatile supply on hand.