BearKiller

Metric bolt.

Larboard fore bottom corner of the engine-block is a flat surface to which is bolted the big GROUND cable, either an 18- or 19-MM head on the bolt.

Can anyone tell me the thread-pitch/size of this GROUND bolt AND the length ??


Also, on this same flat surface, about 1-1/2" ahead of the GROUND bolt is another threaded hole; is this hole the same size as the GROUND bolt ??


It got dark on me before I could get this all checked out; and, if I know what I need, I can pick up a bolt tomorrow at work.

I am wanting to think 12-MM X 1.75 or somesuch, but it must surely be larger than that ??

Thanks.

bgilbert

Yes it's the same size. I know this from very recent. It might not be the same depth though. I got about half way with the ground bolt during my RV conversion and knew right away I was in the wrong hole lol.

BearKiller

Can you remember if the existing GROUND bolt is long enough to put a second cable-lug on it ??

I would have just screwed the thing out and brought it in the shop, but I couldn't disable it thus as she was fixing to take off in it.


Thanks.

BearKiller

Both the GROUND-bolt and the empty hole just ahead of it are size 12MM x 1.75.

The factory GROUND-bolt requires an 18MM wrench.

A standard metric hardware-store bolt has a 19MM head.


I cleaned out the empty hole with a tap and used a bolt that has 1-3/8" thread-length.

By itself, the bolt bottomed in the hole with maybe a sixteenth left before the head made contact.

It tightened up good with a copper-lug and lock-washer under it.


My mission was adding a 14"-long 2/0 GROUND-cable between this new bolt in the engine-block and an existing nearby hole in the frame which I tapped 1/2-13