vibration in the transmission on my 55 estate

[quadecz]

I've had a vibration on my transmission which increased at speed so I took the primary partially to pieces and found one of the centrifugal weights on one side has worn through its bush and into the cast iron carrier it sits in jamming it up. Has anyone come across this before and can anyone suggest a solution. It looks like the weight carrier is part of the assembly that holds the diaphragm. Many thanks.

[macplaxton]

Yep. Had that on a 66. Either swap the primary whole, or find a good centrifugal weight carrier assembly.


Primary Unit Internals NS 003 by macplaxton, on Flickr

If you look very closely (click for a larger version) the pivot pin to the right-hand weight is missing it's clip and the hole is oval. In this case, it hadn't jammed it up, but it had made it rather floppy in comparison to the good side. If you look very closely above the right-hand weight itself, you can see that the diaphragm spring is broken at its circumference too.

Only other thing I can think of is working out some sort of method of reliably sleeving the hole, without changing the weight/balance of it.

[quadecz]

That look exactly like what's happened to mine. Are the weight carriers interchangeable with any other models or are they 55 only? Also are they desperate to the diaphragms as it looks like they're fixed together? Thanks, Richard.

[mattsdafs]

This is not good ...and 55 primary's are very hard to get hold of...but I can help...it does mean another trip to central 1 Sunday for you though...44 primary's can be fitted to 55's but the gearing is different,they work ok though...we need Tina back on the road

[quadecz]

Thanks Matt, I've had a couple of thoughts and a fiddle with Tina's gubbins:

As the pivot bush for the weight was worn through but not broken (it had gone U-shaped) I've turned it around so the good part will take the strain and then used a section of phosphor bronze bush to make up the missing part and another section of bronze to fill in the gap that was worn in the casting. Its all gone in there nice and solid and I've used some bearing locker to hold it in place. This bodge wil either last ten minutes or ten years but at least it will prove the point that this problem was the cause of all the vibration. I also discovered that the propshaft spring wasn't on the prop so I guess the shaft had slid back and was bouncing off the primary. I found the spring rolling around in the boot!

Depending what happens if another primary is available that would be good as I could fit that and then give the weight carriers out of mine to my engineering shop to re-bush them. I'm pretty sure he'll be able to sort them out. Them I could put the right primary back on the car again.

As ever, many thanks for your help, Richard.

[mattsdafs]

Pics please Richard...let's hope it lasts but I can sort a primary for you if need be

[macplaxton]

Feb 15, 2014 8:11:41 GMT quadecz said:

Also are they desperate to the diaphragms as it looks like they're fixed together?

Separate?

Yes, but as you've probably already found out, they are bolted together.

[thebear54]

Just had a thought..... (scary isn't it?)

A certain amount of DAF 55s had this problem. It might be worth a look. This problem would also give you vibrations.





John

[quadecz]

Thanks for the pics John, am I right in thinking that's the rear subframe? If so its in good condition as I had it out and cleaned it up and painted it.

I kind of proved the point with the primary unit as after my bodge with the weight carrier it changed the characteristics of the problem: for a while it all became smoother (although far from perfect). It hasn't lasted though sadly and is now vibrating like a washing machine on spin so I guess replacing the transmission is the only option.

Apart from mine it a very long time since I drove a Daf so its hard to work without some comparison but I seem to remember them being very smooth with only a slight wizz of belts.

I'm pretty sure the car's got the right hump with me though as something in the indicator circuit is now blowing fuses! Pigging cars!!!

[macplaxton]

Feb 15, 2014 10:36:20 GMT quadecz said:

This bodge wil either last ten minutes or ten years but at least it will prove the point that this problem was the cause of all the vibration.

Feb 16, 2014 15:31:58 GMT quadecz said:

for a while it all became smoother (although far from perfect).

Define "a while"? Ten-and-a-half minutes?

Good luck with sorting out a longer term solution.

re indicators...Maybe a wire is chafing somewhere and shorting out.