reverse collar slippage

[prstack7]

Recently I lost all reverse. I tightened the collar and gained reverse again, but then after a few weeks, no reverse. Is there a way to "hold" the collar after I tighten it? Why would it slip?

[Dave Neptune]

7, are you saying you have no reverse or it is slipping in reverse? I could be he linkage and often is!
Remember reverse is accomplished by "holding" it engaged where in forward it locks in place with the detent.
No real sure of he question.

Dave Neptune

[ndutton]

There's a brittle spring clip that's intended to keep the adjustment nut from moving. Sounds to me like yours has broken away. If this is the case, at this time they are not available.

It happened to me on my project engine. I looked at the clip crosseyed and it broke. It still had one of the two legs remaining, the MMI manual says it will continue to function that way but that wouldn't do for me. I ended up making a replacement out of 0.091" spring steel music wire.

[67c&ccorv]

There has to be a better way than that spring wire clip Neil...I see another "wish list" product in the making!

[ndutton]

I don't have a problem with the clip design but you're right, there's more than one way to skin a cat. It took me three iterations before I was able to produce a replacement clip. The first one I didn't get the bends tight enough and the symmetry was way off. The second turned out excellent but broke upon installation. I believe my bench top heat treat process turned it as brittle as glass. The third, pictured previously, I eliminated the heat treat process and that's where we are.

My goal is to adjust the band without removing the clip. I want the clip springy enough to expand on the adjusting nut peaks and spring back to hold against the flats. With the Kaminski modification it makes reverse band adjustment a one hand operation.

[prstack7]

don't have one of those

I don't have one of those spring clips. There is nothing to hold the nut from loosening. However, when I adjusted the forward collar and brake band this spring, the band held for months. It's only recently that the band has loosened.

[Don Moyer]

Neil is correct in pointing out that adjustment of the 3/4" nut is intended to be made with the spring in place. Also, in my experience, if you do have to remove one of these springs for any reason, they are very prone to break during the installation process unless you hold the retaining bolt from turning (even a little bit) with one wrench while tightening the nut on the other end of the bolt. Don

[ndutton]

Don,
Do you think a flat washer between the bolt head and the spring clip would make breakage a little less likely?

[Don Moyer]

You would think so Neil, but Universal's (somewhat unlikely) configuration was to use a lock washer between the head of the bolt and the spring and nothing under the nut on the other end of the bolt. I always dutifully (OK, blindly?) followed their lead and never broke another spring. That said, I have to believe that a flat washer would work just as well. Don

[ndutton]

I'm thinking narrow shoulder flat washer on the spring, split lock washer under the nut on the back side, slightly longer mounting bolt.

[Don Moyer]

Sounds like that should work fine. But again, be sure to hold the bolt firmly as you tighten the nut. Don

[ndutton]

Got it. No motion allowed on the spring clip side, compression only.

Thanks

[67c&ccorv]

I was thinking along the lines of a stainless spring ball plunger held in place by the current wire spring bolt indexing on a stainless 3/4" hex bolt with an integral indexing collar (the collar would have the index holes drilled in the side as opposed to the photo which shows the index holes drilled in the flat).

[prstack7]

I do have one of those clips

I'm glad I've given occasion to think about the brake band nut and the clip. After more careful inspection, I discovered I do have an intact clip. I suppose I didn't notice it before because I wasn't looking. Also, I noticed that the brake band does hold in reverse quite well. No need to tighten the nut. This brings me to the conclusion that the problem is in my pedestal linkage to the shifting cable. I don't know why this problem would be intermittent.

[67c&ccorv]

I found a spring that may solve the adjuster breakage issue - from a Norton Commando gearbox...this one won't break but it looks like a collar would be required to center it to the fixing bolt.

The spring in question is the middle spring of the three in the kit.