Search found 139 matches

by rjk40
Thu Jan 11, 2018 1:31 pm
Forum: Engine & Transmission Shop
Topic: How to compress piston rings. STRUGGLE
Replies: 9
Views: 3167

Re: How to compress piston rings. STRUGGLE

Mystery Solved! After much head-scratching, I contacted Deves, piston ring manufacturer, and found that the fourth element on the oil ring, what they call the expander, sits behind the scraper and pushes it out, thus keeping the upper and lower rails in place. The documentation does describe the Dev...
by rjk40
Mon Dec 11, 2017 10:34 am
Forum: Engine & Transmission Shop
Topic: How to compress piston rings. STRUGGLE
Replies: 9
Views: 3167

Re: How to compress piston rings. STRUGGLE

Thanks, Ducadini, Yeah, the biggest challenge is posed by the fact that I was doing the deed with the piston still on the rod, because, at the time, I could not find a source of wrist pin circlips, not EVER wanting to re-use the little monsters. I have since found a source for them, and will proceed...
by rjk40
Mon Dec 04, 2017 2:25 pm
Forum: Engine & Transmission Shop
Topic: How to compress piston rings. STRUGGLE
Replies: 9
Views: 3167

Re: How to compress piston rings. STRUGGLE

Hi Steve, Yes, I have looked at many youtube videos, and the only one that matches my scenario of doing the process with the piston in place on a vertical cylinder is for a Harley, using no spring compressor and lowering the cylinder very carefully onto the piston, compressing one ring at a time. Th...
by rjk40
Sat Dec 02, 2017 1:31 pm
Forum: Engine & Transmission Shop
Topic: How to compress piston rings. STRUGGLE
Replies: 9
Views: 3167

How to compress piston rings. STRUGGLE

Ok, this old man is really feeling stupid, trying to get the blasted three piece oil ring to stay in place while lowering the compressor over it. Would really like some help (likely a technique...). Bike is 1975 Ducati 860GT. Trying to fit the vertical cylinder top end back on after refreshing (cyli...
by rjk40
Fri Jul 07, 2017 6:38 am
Forum: Engine & Transmission Shop
Topic: 860GT piston ring gap orientation
Replies: 4
Views: 3165

Re: 860GT piston ring gap orientation

Thanks for the info.
I appreciate your comments.
Info exchanges such as this forum really help.

Regards,
Richard
by rjk40
Thu Jul 06, 2017 11:05 am
Forum: Engine & Transmission Shop
Topic: 860GT piston ring gap orientation
Replies: 4
Views: 3165

Re: 860GT piston ring gap orientation

Hi Steve, Thanks for the info. Yes, I have googled and found many answers. All diagrams I have seen do not specifically show the thrust face in the diagrams, as is the case with the Deves Rings' instruction sheet that I purchased from you. The diagram you provided in this post is thus far like many ...
by rjk40
Tue Jul 04, 2017 3:13 pm
Forum: Engine & Transmission Shop
Topic: 860GT piston ring gap orientation
Replies: 4
Views: 3165

860GT piston ring gap orientation

This old man is confused: What I have seen when replacing the rings leaves me with an unanswered question, one that I could not foresee when removing the cylinder for refreshing. Given: new rings (3), with a three-piece oil ring; this gives five gaps to place equally around the periphery of the pist...
by rjk40
Sat Jun 03, 2017 8:58 am
Forum: Engine & Transmission Shop
Topic: 860GT base gasket question
Replies: 7
Views: 4582

Re: 860GT base gasket question

Hi Craig, Ducadini, As I ponder this, I have concluded that my choice of copper for the base gasket is unnecessary in the case of my bike, and will move forward accordingly. Still wondering about gasket sealant, even with the paper one; in past experiences, any time I have used a paper gasket (mostl...
by rjk40
Fri Jun 02, 2017 2:31 pm
Forum: Engine & Transmission Shop
Topic: 860GT base gasket question
Replies: 7
Views: 4582

Re: 860GT base gasket question

Replying to self here: I have seen positive reviews on the use of Permatex copper gasket sealant. This might be a much better choice than my idea of using anti-seize. Have any of you gurus out there had any experience with this? Given the position of the 860GT base gasket, I would venture to use the...
by rjk40
Fri Jun 02, 2017 1:21 pm
Forum: Engine & Transmission Shop
Topic: 860GT base gasket question
Replies: 7
Views: 4582

860GT base gasket question

When installing a copper base gasket, does one install it dry after thoroughly cleaning the mating surfaces, or is some other method used with some kind of sealer? The factory paper gasket was glued on, and took some effort with a ScotchBrite to remove it. Penetrating oil did little to help. I see d...
by rjk40
Thu Jun 01, 2017 1:22 pm
Forum: Engine & Transmission Shop
Topic: 860GT valve seal confusion
Replies: 5
Views: 3149

860GT valve seal confusion

Hi All, I know that this topic has been visited many times, and after reading the Forums and after getting into the top end of my bike, engine s/n 851539, I have found that the valves have the cap type seals , not o-ring seals; this cap type seal matches my parts manual, but not some postings elsewh...
by rjk40
Tue Mar 28, 2017 2:13 pm
Forum: Engine & Transmission Shop
Topic: rotor reverse threaded? 1975 860GT
Replies: 7
Views: 3222

Re: rotor reverse threaded? 1975 860GT

Yeah, I got the first one out by punching from the backside into the small hole, and it eventually came out, but the second one refused, so I drilled and dremeled it out. used about 6 pin punches and one Dremel tungsten carbide cutter. Phew! Judging by the 860GT parts manual, the crankshaft gear, fl...
by rjk40
Thu Mar 23, 2017 9:20 am
Forum: Engine & Transmission Shop
Topic: rotor reverse threaded? 1975 860GT
Replies: 7
Views: 3222

Re: rotor reverse threaded? 1975 860GT

Finally had to resort to drilling and Dremeling the last stubborn pin out.
Even though the parts manual shows it as a pin, it seems like it is welded in.
Biggest challenge will be to grind enough out to maintain a fairly good balance on the gear.

Anyone else had this issue?
by rjk40
Sat Mar 11, 2017 11:57 am
Forum: Engine & Transmission Shop
Topic: rotor reverse threaded? 1975 860GT
Replies: 7
Views: 3222

Re: rotor reverse threaded? 1975 860GT

Yeah, no surprise at that. The hex holes in the heads were damaged, either from the factory or by the dealer that replaced a bad stator many years ago. I was able to get the durned things loose by pushing hard on the hex wrench whilst applying brute force counter-clockwise. I consider myself lucky (...
by rjk40
Wed Mar 08, 2017 7:42 am
Forum: Engine & Transmission Shop
Topic: rotor reverse threaded? 1975 860GT
Replies: 7
Views: 3222

Re: rotor reverse threaded? 1975 860GT

Thanks for the reply; after further review, I found three replacement screws in the Sachse ignition kit, and had I had any forethought I would have found them, and seen that they are "regular" threads. Getting new ones with the kit is great, as the original ones are seriously "hogged" to where the h...

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