ST1100Y @ >150,000km...

[ST1100Y]

Well, no use in procrastinating, this job is due...

safety first...




everything in there is covered with a fine layer of brownish dust...
so there is wear on those belts...




also idler and spanner suffered, you can feel some clearance when wiggling, and that significant, grinding noise when spinning by hand...




precautionary also replacing the pump; don't like having to dig into there again soon...




darn internal bypass broke upon touch, could have failed any moment, good that'd I'd scheduled the job now...




replacing w/pipe O-rings while at it; getting the PAIR plumbing out the way, takes the most effort...




new elbows and braided silicone coolant hoses (surely adds 2kph to the top speed )




also the internal bypass now with braided silicone line, should last a while now...




tomorrow I'll throw a new pump, spanner and idler in, and install the new belt...

 

[Larry Fine]

" . . . All for the want of a nail."

 

[Uncle Phil]

Yep, I'm firmly in the 'replace the water pump when you do the timing belt' camp now.
After a failure at 130,000 (catastrophic) and 140,000 (bad leak) that fully moved me over.

 

[Obo]

After a failure at 130,000 (catastrophic)

I still say that wasn't my fault!

 

[Uncle Phil]

I still say that wasn't my fault!

Well, you can deny it all you want if you like ....

 

[Larry Fine]

"I didn't say that it was your fault, I merely said that I am blaming you."

 

[Road Slug]

Looks like your belt was still in good shape.
You rebuilding the pump yourself? Kit?

 

[Andrew Shadow]

Kit?

ST1100 water pump rebuild kits

From this forum;

ST1100 Water Pump Overhaul Service​

 

[Road Slug]

ST1100 water pump rebuild kits

From this forum;

ST1100 Water Pump Overhaul Service​

Thanks.
I heard timing belts were getting scarce too.

 

[Uncle Phil]

Thanks.
I heard timing belts were getting scarce too.

Supposedly Gates has quit making them.

 

[Erdoc48]

Partzilla still has the belt listed but at $172! Little by little there’s fewer parts for our beloved bikes.

 

[ST1100Y]

since decades I forget that the gasket is included with a new pump...



will use it when refurbing the old pump....


whilst I understand the philosophy to install paper gaskets dry, I hate it, massively...




in proximity of a open bearing... great, just great...




took me nearly an hour... gasket remover won't do much... fiberglass pen is a great tool though...






all installed...




t/belts are sensitive to all kinds of contamination... also skin oil... hence keep it sterile...




perfectly on the markings... on the first throw




two rotations by hand, then I released the spanner...




new carb boots, OEM filter...




filled coolant, carbs back on, fired instantly, let her idle till fan kicked in... no leaks
The silicone hoses stink up the place for a while though...

Next w/e I'll check valve clearances (and yes, new cover gaskets are going to be used ), and do a carb sync...

 

[ST1100Y]

Partzilla still has the belt listed but at $172! Little by little there’s fewer parts for our beloved bikes.

Yep, that OEM belt has gone shockingly expensive... that why I'd chosen the Gates belt for € 54,- instead...

 

[ST1100Y]

Looks like your belt was still in good shape.

Nope, as written was fine, brownish dust everywhere...
It also must have stretched, cause when I loosened the spanner it popped in for another 3mm...

 

[Sunday Rider]

Did that grinding noise go away? What is the spanner part you replaced. Was this the first timing belt replacement on the bike?
Wonderful write up and pictures. Thanks!

 

[Larry Fine]

Would any of you have a parts list for the pump replacement: pulleys, gaskets, O-rings, etc?

 

[ST1100Y]

Did that grinding noise go away?

The '00 never had the grinding noise...
The '94 does... still under investigation (that's the next project though...)

What is the spanner part you replaced.

P/N 14510MT3003, T.B TENS COMP

Was this the first timing belt replacement on the bike?

Yep, but it seems I shouldn't have waited that long...

 

[Sunday Rider]

The '00 never had the grinding noise...
The '94 does... still under investigation (that's the next project though...)

P/N 14510MT3003, T.B TENS COMP

Yep, but it seems I shouldn't have waited that long...

You said there was a grinding noise in the first post but I see it was when spinning by hand.

 

[ST1100Y]

Yep, I'm firmly in the 'replace the water pump when you do the timing belt' camp now.
After a failure at 130,000 (catastrophic) and 140,000 (bad leak) that fully moved me over.

Spanner and idler pulley show definite wear...
When spun by hand they run kinda "free" with a significant "chchchchchchch...!"
You can also sense some clearance and notchy balls inside... friction that will definitely cause heat during operation -> even faster decay + additional heat accelerate ageing/wear of the belt...

So to all fellas stating those bearings would never need replacing... nay!

And waiting beyond 100,000 miles also seems as "asking for it"...

 

[Uncle Phil]

I figure if you are in that deep why not replace both of them also - assuming you can still buy them ...