The Cessna 120-140 Association Forum

Hello all,
We are changing out the worn engine mounts (conical style) does anyone know a source for the metal spacers and grounding straps?
The metal spacers that hold the conical mounts in have the following dimensions:
ID .380”
OD .440”
Wall .032”
Length 1.90”

We have two grounding straps that are cracked. Has anyone found a source for these?

Thanks for the help

I used a flat braided strap like a battery ground. I went from an engine stud to the mount.

Hello,

I will inspect the grounding of my C85 12F soon,
It would help me if you please post a photo when you finish your grounding ?

Thanks a lot,
Regards,

It's pretty simple. There is a strap, one end attaches to the bolt opposite the one that holds the oil fill tube to the engine case (same spot on the opposite side of the engine) and the other end goes between the head of the engine mount bolt and the engine mount itself at the lower left mount point.

I've tried to find those spacers there just not available. I've also been told the newer mounts have a smaller ID. and the spacers are not needed? the last set of mounts we installed we did not use spacers but its hard to get the proper torque without them thinking that the washers bottom out on the spacers to give you that number? Keep me informed if you find out different.

The Continental overhaul manual Figure 14 shows the mount, without the spacers. I've never found any evidence, but it makes sense that the ID of the rubber mounts was once larger. The spacers DO NOT FIT in the current mounts. They had worn through the rubber parts on my plane back in about 1990, so I removed them. IIRC, they're made from off the shelf chrome-moly tubing. Also, IIRC, the bolts called for in the parts catalog were too long once the spacers were removed.