ottafish said: Click to expand...
damn - one (me) should read, precisely, all - loland thx to you @ottafish so here my answer to the clutch questionyes a 16-18 i have also at my ´00 (i guess)i guess because when pump got installed and bleeded i felt as if the lever was - for me - too close to the grip when releasing the clutch only a little bit ~ 5-10mm and the clutch started "grabbing".so i think i "unfortunately" got a 15 dia clutch pump, what then causes that the pumped volume to the slave is not really sufficciant.to reverse that "unfortunate" feeling i replaced the 38 mm dia slave (´99-´02) by a 36 mm dia slave of the ´03with full success.clutch is now dosable at its best and still as easy to pull as a 10 year old child would be able to pull the lever fully although stronger springs are built in the "basket".
Looks like this topic has gone cold, but I'll post my experience on bore size and fluid for the record.
Summary: I prefer the 0.70" diameter clutch Master cylinder. Silicone fluid seems to have caused excessive wear of the clutch system seals.
My clutch hydraulics weren't working this spring when I was preparing to start driving my '69 TR6. I had been happily using DOT5 silcone fluid in both brake and clutch systems for over 20 years. I had chosen to use the silicone fluid many years ago because I had seen the paint damage caused by DOT 3 or 4 conventional fluid. I replaced the silicone clutch fluid a few years ago because it was looking very dirty. This spring, the master cylinder, which was 0.75" dia, didn't seem to be producing any pressure, even after bleeding and refilling the system, so I replaced it with a 0.70" diameter unit, which was the only one I could get locally. I was assured the 0.70 unit would work fine, and it does. The clutch friction point is now closer to the bottom of the stroke, and seems easier to control than the original 0.75" unit, so I actually like it better.
When I took apart the old MC, the parts and cylinder bore had a lot of black sludge that I think was preventing the seals from functioning properly. There is no sign of corrosion, in the cylinder bore or any of the internal parts, so I think the sludge came from wear of the seals. The slave cylinder was also full of sludge, and replaced. The new MC unit, which came from MOSS, had a warning on the box that stated "Using Silicone Brake Fluid Will Void Warranty". Right now I am running with DOT 3 brake fluid in the clutch system and DOT 5 silicone is still in the brake system. I have read that silicone brake fluid isn't as good a lubricant as conventional brake fluid, and I think over the many years it might have caused wear of the rubber seals that produced the black sludge in the clutch system. The brake system fluid seems to stay clean and works OK, but the pedal is a bit more spongy than I'd like.
You will get efficient and thoughtful service from MOTEC.
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