Breva 750 2005. Rubber bit in the sump

[Gray Kay]

My Breva is relatively new to me, had her 5000 km and 1 year (now has 95000km)

Goes great in the Queensland sunshine (Australia) and is my go to work bike daily.

Finally did my first oil change, I had just done a 750km camping trip with family and almost changed the engine oil before I went, luckily ran out of time.

So, after the trip, had a 100km run and into the garage for the change.

Rear sump plug out ok, but the front smaller one was only finger tight...unfortunately not loose, but stripped. Removed the filter ok.

As I have a mechanical background, I pulled the sump off to do the repairs, fitted a larger plug, up to 12mm from the original 10mm, so a much stronger thread now.

My question to you all is this, see the photos, I found these bits of black rubbery stuff in the sump...

The 10mm ring spanner there for size comparison.

I have no idea what the previous owner did, but they got in there somehow.

The bike runs great, very happy.

Live in the Gold Coast, Queensland, Australia.

Had a Lario before this Breva,

and my Mistress since 1971... www.allpan.com.au/gk/ajs

Cheers Gray.

 

[Da Rev]

looks like a jig saw puzzle. Do they fit together somehow, because those bits look like they should.

 

[john zibell]

I suspect the cam chain tensioner may be coming apart. With the mileage on the bike it is possible it is failing. Probably could stand to have the timing chain replaced as well.

 

[Gray Kay]

looks like a jig saw puzzle. Do they fit together somehow, because those bits look like they should.

Thanks for your reply... I haven't been inside the motor as yet, so unsure what is there... aside from looking at exploded drawings.
The best I can say is the pieces look like a black tap washer (hot or cold water) about 20mm outside diameter and seems to have a smal hole.
Maybe completely wrong, but hopefully will trigger an answer.
Would the cam chain tensioner be breaking down like this?
and if so, would these pieces be able to drop into the sump?
Cheers Gray.

 

[john zibell]

The tensioner is the only non metal part in the engine. Also with the current mileage it wouldn't hurt to replace the timing chain so you should go in anyway.

 

[Gray Kay]

Yeehaaa...Found the answer.

Finally found some time to change the timing chain and tensioner.

Here's what I found inside the case. More rubber pieces...

See at the top of the tensioner... no rubber bump stopper.
Steel tensioner sitting against the case.



New tensioner (top) and old one below.



and this is how the pieces found their way into the sump area. Two holes about 25mm diameter.



Rubber stop as fitted to the new tensioner.



and sitting against the alloy case.



Today... seemed a little smoother and quieter, but that could be my mind saying...Well done for finding the problem.


I didn't thing the pieces of rubber in the sump would do any harm, but job done and back to riding with my mad mates.
Cheers from Oz.