Rear suspension tower, chassis to body bolts

[paddy]

I think I've tracked down an annoying rattle to a loose bolt between the body and tower.

One side has a 5/16 UNF bolt and the other has a 3/8 UNF. Both seem to be in bobbins with 7/16 (untapped) holes.

What size should the bolts be?

Any problems expected if I drill/tap them out to the right size?

Thanks in advance.

Paddy

[lotusfan]

Hi Paddy

They should be 7/16 UNF. It shouldn't be a problem drilling and retapping the 5/16 hole but you may only get a partially tapped hole in the other.

Look at the following site http://www.carbidedepot.com/formulas-tap-standard.htm

The minimum diameter of the 7/16 is just less than the major diameter of the 3/8 so you may be lucky.

Give it a go, don't forget - lots of oil on the tap!!

Mike

[gerrym]

As per Mike's reply, the threads should be 7/16". Just to clarify, the chassis itself should have the tapped/threaded holes with plain bobbin holes. If there's 5/16" and a 3/8" in there, I would suspect a previous owner bodge, so go in with some caution.

Regards

Gerry

[paddy]

Thanks for the replies, all now sorted. No rattle.

Unfortunately "previous owner bodge" is my first assumption for any problem these days.

Paddy