[Big D]

Hi Ron,

Thanks for that.

I thought I would give everyone the latest on my wee project to see if any of you carrier gurus could offer some more advice. I find it also helps to think through the problem by describing it in writing.

After getting the camplate assembly out I did an overhaul of it.

I found the left side clevis (the problem one) to be quite sloppy in how it fitted around the camplate. I fixed this by squeezing up the entire opening on the end of the clevis and now it fits much more snugly around the camplate. The screw fitting at the end was still a nice fit. The movement that was obvious in this clevis before is now gone.

The right side clevis looked good.

I took the covers off the bearing and found that to be in good condition.

I cleaned up the baseplate, put a bit of paint on it and reassembled everything using a wee bit of loctite on the clevis screws.

I got one of the club guys to make up a nice washer of about 3 mm thickness to fit onto the cam. This seemed to do the trick and I figured the extra height with the raising of the camplate would do the trick in clearing the hullplate.

I refitted the whole camplate assembly today and from what I could initially see there was a good 2 mm of clearance between the underside of the clevis on each side to the metal surround on the hull that the camplate is bolted into.

All good I thought.

However, I then noticed the tops of the clevises were now rubbing on the hull cross-shaft! This was something I hadn’t even considered. From a distance there seemed to be enough clearance here.

I took the camplate assembly right out again and removed the washer I had put on. I refitted the camplate assembly and then managed to get a feeler gauge between the right side clevis and the hull cross shaft. Without mucking around too much with various gauge sizes I found there was about 1.75mm of clearance. I figure there may be a maximum of 2mm in clearance but I’ll confirm this once I get more time.

Obviously something isn’t quite right here and I expected a little more in the way of leeway between the bottom of the hull cross shaft and the tops of the clevises.

I’m now back to thinking about a combination of little fixes which might help solve the overall problem:

• Get another thin washer made of about 1mm in thickness to go on the camshaft
• Grind down about 0.5mm off the length of the top side of each clevis, which with the added height should help it clear the hull cross-shaft
• Grind down the underside of the front of each clevis by about 1 mm, which should help it clear the plate on the hull
• Grind down the plate on the hull that the clevis rides over, but getting at this area is still a problem


I figure there is not the clearance availabe to just fit a thinner washer and solve the problem.

Any thoughts chaps? Appreciate all the advice to date.


Thanks

Darryl