Manifold Paint

• Exhaust coating

I used Eastwoods's Factory Gray High Temp Manifold Coating on my AC-B replacement manifold two years ago. I have had decent luck with other Eastwood products so I am not going to blame the paint, however I am quite dissatisfied with my result using it. I thought I followed the instructions as best I could. It was in the winter and I was unable to reinstall the manifold and run the engine for 20 minutes as instructed. Instead, I put the manifold in a woodstove oven for about a half hour or so for final cure, installed on the tractor and didn't run it until a couple of months later. I am going to chaulk that up as my mistake. As you can see in the below before and after pictures, the coating has essentially completely rusted through. The tractor is a working one that is outside all the time. Perhaps that is some of the problem, but I expected much better performance. The rust began showing up about 2 months after it was outside.

Then and now:

If you have any thoughts on what my problem could be, I would be interested.

Rod

Rod

By the way, you have a wealth of info, thanks.

You're welcome. Yes, that plate is supposed to be in that location. It was supplied originally on Bs and Cs. It shows up in the early parts books as part no. 207487, "manifold cover" and in later parts books as part no. 208009, "manifold cover". I don't know what the difference is between the numbers, if any. The original manifolds had a large flat area the size of the plate and 1/4-20 tapped holes that permitted the mounting of it. All new reproduction manifolds do not have such a provision. I had to modify that replacement manifold by adding bosses and tapping holes in order to mount the plate. It's not exactly original but at least the plate is back where it belongs. I've had the plate kicking around in one of my tool boxes for the last 30 or so years and just decided that I wanted to put it back on the manifold.

Here's what the manifold looks like after I added the bosses:

I don't know where you can obtain an original plate. They'd be pretty easy to make though. The text information is engraved in place. Here's a close up of my '42B plate:

A detailed drawing of mine is available here in pdf format if you want to make one or have one made.

Rod

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