Mystery plug...

[JustJim]

Good news, is that I received my engine back from the machine shop this week. It cost about twice what I had hoped, but I suppose that's hardly surprising.

Bad news, is that it came with a small pile of loose parts. I had hoped to enlist the services of the shop to measure my cylinders, and then make an informed deciscion about the neccessity of a rebore. For that reason, I had not pulled off the rear mainseal retainer nor the oil pump, as I really hoped I would just be doing the valves. Didn't work out that way.

All the parts were pretty simple to puzzle out, but I am left with a plug i can't find a home for.

IMG_1666 by Jim QRB, on Flickr

It's .540" by 18 TPI. I've looked pretty carefully, and have yet to find a place for it. It may have been on the workbench from another job, and may not go to the Cub's block at all. But I really don't want to get everything together and find I have to disassemble again because I overlooked the proper location of this.

It's not the priming plug for the oil pump. That one is in place, and it's smaller in diameter. Does this look familiar to anyone as belonging in the block of a Cub? I'd appreciate any help...

[indy61]

It may be an oil galley plug. There is one behind the front cover and one behind the valve tappet cover that are sometimes overlooked.

[Barnyard]

If it is an oil galley plug you need to have the shop put it back before you start the engine.

[JustJim]

I told my darling' bride that I was pulling my hair out trying to find the home for that plug. She said, "Why not ask your buddies on that Cub forum?"

Well, now I'm going to have to tell her she was right (as usual), and that you fellows solved the mystery right off! Indy61 and Barnyard, you nailed it. The plug was hidden behind the camshaft gear. There's a shiny new stainless plug there, so the old gent who did the valves replaced that when he installed the camshaft and its gear.

Thanks once again friends!

[indy61]

Good to hear, I hope the rebuild turns out well for you. I assume you checked the galley plug behind the valve cover.

[Bill Hudson]

Answer in 31 minutes, not bad.

Bill

[ricky racer]

That 1/4" NPT plug is the only oil gallery plug of its size in the C60 engine. All others are 1/8" NPT. Just for reference....

[JustJim]

Indy61 - Yes, thank you, that one is present.

[Pap]

Hey Brother looks like you are going to have spare parts...... ...Jim I know that you will find somewhere to put that piece.

[Barnyard]

FT

Jim I know that you will find somewhere to put that piece.

I think he already did.

[Pap]

Hey I am just messing with my friend Jim....

I can read.... I know that he knows where it went.