Hi Stanley, Thank you for your offer. I actually can do better than a sample. I have the actual sizes. The large intake to cylinder o-ring is 33.7mm X 2.6mm. The small oil o-rings are 5.6mm X 1.9mm and 5.5mm X 1.4mm. These of course need to be impervious to oil and fuel. I found some that were close in size locally but they were just run-of-the-mill o- rings. I'd like to get Viton or some other composition that won't fail on me in the near future.
On Apr 28, 9:49 pm, stanley/ Randolph <[email protected]> wrote: > If you send me a sample, I think I can send you some O-rings > > Stanley > > ________________________________ > From: tharrisn <[email protected]> > To: Nighthawk Motorcycle Lovers! <[email protected]> > Sent: Tuesday, April 28, 2009 7:36:50 AM > Subject: [Nighthawk Lovers] Re: NOISE cont. > > I found some caps for the anti-foam chambers and have ordered them. > Should know shortly if they're available. They weren't too expensive > and got a bunch of new o-rings for the oil pipes too. Only found one > of the eight a little marginal but the manual said replace 'em all. If > the place I ordered the caps can't get 'em I'll go the sealant route. > > Everything else looked good. No pitting, holes or scarring on the cam > lobes or bearing surfaces. Before putting the bearing caps back on I > smeared a very light coat of moly grease on the lobe and bearing > surfaces. > > While I have everything kinda apart (I didn't have to remove the > camshafts totally to get to the hydraulic adjusters) I figured I might > as well work over the carbs too. Can you point me to a good resource > for rebuilding the carbs? I think I read you don't recommend removing > the diaphragms and to use some appropriately sized piano wire to > insure the jets are clean. Along with the other parts I've ordered new > o-rings for the carb to cylinder junction. Sure would like to use > Viton o-rings as replacements but it's REALLY hard to find stuff like > this locally. > > On Apr 28, 12:05 am, Dennis Hammerl <[email protected]> wrote: > > > OK, not too bad on your part. I'm a little foggy with some of your > > terminology but I think I get it. Yes, you can reseal the anti-foam > > chambers with a good silicone seal. Allow 24 hours before starting the > > engine. I always fill them with oil before re-assembly. With the silicone > > that may be a problem. Oil and silicone don't get along before the silicone > > sets up. At least put some in and clean the gasket surface with alcohol > > before the silicone is applied. How did the cam lobes look ? No scaring ? > > holes, pits ? > > > --- On Mon, 4/27/09, tharrisn <[email protected]> wrote: > > From: tharrisn <[email protected]> > > Subject: [Nighthawk Lovers] Re: NOISE cont. > > To: "Nighthawk Motorcycle Lovers!" <[email protected]> > > Date: Monday, April 27, 2009, 9:14 AM > > > Dennis, > > > Update to the '83 CB650SC Nighthawk hydraulic valve adjuster > > "tapping" > > saga. It's been awhile since my last post but it's taken awhile to > > collect this information...besides the weather has turned nice and I > > was riding the thing. <grin> > > > I added Marvel Mystery Oil and then put several hundred miles on the > > bike results: > > > - The intermittent clatter cleared up initially but now is pretty much > > all the time > > - With stethoscope isolated trouble to cylinder(s) 1 and/or 2 intake > > valves > > > Since the clatter is all the time now that was a good sign for me > > (makes it easier to diagnose). Anyway, decided to pull the cam cover > > off and take a peek. Found a couple things. > > > - oil hole caps on intake and exhaust 1 and 2 cylinders in poor shape > > - inspection and bleeding of all tappets revealed six of the sixteen > > somewhat marginal > > - visual inspection of everything else looks good > > > The oil hole cap on the intake was even out of place a bit leaving the > > oil pocket open. (Of course the cap could have been dislodged when I > > took the cam cover off but none of the others were. Anyway, the rubber > > lips on both caps were cracked and broken in several spots. The intake > > again was the worst. > > > Aha, says I. Since this oil pocket is supposed to keep the oil to the > > adjusters from filling with air bubbles maybe this oil pocket cap > > isn't doing its job? > > > Replacing the hydraulic adjusters was going a little overboard since > > they really weren't too bad. I had some spares that tested a bit > > better so installed them just for grins. > > > Ok, question...does anyone on this list have some spare oil pocket > > caps? Do I need to replace these bad caps or maybe a good silicone > > sealant will inject new life into the existing caps by sealing them on > > the oil pockets? What do you think Dennis? > > > Thanks for all the help. This project is turning out to be kinda fun. > > > On Mar 16, 12:58 am, Dennis Hammerl <[email protected]> wrote:> Good > > thought, however you used Sea Foam. That should have cleaned that up > > > if it works like they say it does. Do the MMO, I know what that does. At > > least > > it will shift better. > > > > --- On Mon, 3/16/09, tharrisn <[email protected]> wrote: > > > From: tharrisn <[email protected]> > > > Subject: [Nighthawk Lovers] Re: NOISE cont. > > > To: "Nighthawk Motorcycle Lovers!" > > > <[email protected]>> Date: Monday, March 16, 2009, 12:26 AM > > > > What if there was a little varnish or other debris on the check valve in > > > the tappet. The varnish would allow the tappet to function "normally" > > when fed pressurized oil but would "leak down" fairly easy thus > > creating the clatter after a hot start. Just conjecture but interesting to > > think > > about. On Mar 15, 9:41 pm, Dennis Hammerl <[email protected]> wrote:> If > > the adjuster had failed, no amount of oil pressure would make it SHUT > > > UP. If yours quiets down some times, what do you think ? > > --- On > > Sun,3/15/09, tharrisn <[email protected]> wrote: > From: tharrisn > > > <[email protected]> > Subject: [Nighthawk Lovers] Re: NOISE cont. > > > To: "Nighthawk Motorcycle Lovers!" > > <[email protected]> > Date: Sunday, March 15, 2009, > > 9:08 PM > > Ok, it's get the oil pressure checked first. > > > > It's gonna take me a bit to get back to this project. I'm helping > > > escort a group of teenagers on a back packing trip. Should be fun...I > > > think > > I'm the token old> guy? <grin> > > On Mar 14, 11:33 pm, Dennis Hammerl > > <[email protected]> wrote:> A great question. Before we get into that, > > > I would call your attention to > > the location of the oil pressure > > sending unit and the fact that the upper end > (cams, etc) are the last to > > get oil. That's why I'm so aghast at gonzo > RPM starts. With that in > > mind, it's not too difficult to see that the light > can go off (oil > > pressure good) long before the critical upper end parts get > lube. Many > > years ago we would start a cold CB450 in the garage with no radio > on and > > the door closed. At exactly 58 seconds after start-up, it would suddenly > > > get very quiet. It took that long to oil the upper end ! Lets not speculate > > on> any damage without a real pressure check first. I know that going > > anywhere > > > near > a dealer is like being condemned to hell, but suck it up and take > > this > > variable > out of the equation. In the end you may have to remove the head > > cover just to > examine> the problem. Not yet. > > > --- On Sat, 3/14/09, > > tharrisn > > <[email protected]> wrote: > > From: tharrisn > > > <[email protected]> > > Subject: [Nighthawk Lovers] Re: NOISE cont.> > To: > > "Nighthawk Motorcycle Lovers!" > > > > > <[email protected]>> Date: Saturday, March 14, 2009, > > 11:02 PM > > > Would low oil pressure cause other noticeable problems > > besides the > > tappet noise? > > > I know "idiot" > > lights on cars are notoriously bad at indicating > > problems but what > > about our bikes? I ask because the light comes on as > > it should when > > turning the ignition on but promptly goes off when the > > engine starts.> > > > > On Mar 14, 2:06 pm, Dennis Hammerl <[email protected]> > > > wrote:> > > This is starting to sound like > > > > an oil pressure leakback, caused by #1 thin oil (from heat) or that #2 > > > the Sea Foam has loosened up some grunge that is unable to escape from that part of the system since a I described, is not open-ended. Now on the #1 cause, I'd get a dealer to check its real oil pressure when hot. There is a screw in gauge that dealers have to do this. > > > Shouldn't cost much to check. Low oil pressure can be many things. Don't panic. Since you didn't use anything on the second oil change we can't accuse anything of diluting the oil. > > > > > > > > --- On Sat, 3/14/09, tharrisn > > <[email protected]> wrote: > > > From: tharrisn > > > <[email protected]> > > > Subject: [Nighthawk Lovers] Re: NOISE > > cont. > > > To: "Nighthawk Motorcycle Lovers!" > > > > > <[email protected]>> Date: Saturday, March 14, > > > 2009, 11:17 AM > > > > Doesn't sound like all the tappets are > > noisy but a few and not > all the > > > time. They are the loudest > > after the bike is> hot and sets for ten minutes > or so. > > I can almost > > > guarantee when I start it back up and take off the noise will > be > > > > very pronounced until it eventually quiets back down after a mile or two >> > > (quicker if I rev it a bit). They'll stay quiet until it idles for > > > > some time > > or I shut if off and start it again while still hot. > > I've changed > oil and > > filter twice now in 800 miles. The > > first change I added SeaFoam (1/3 can). > > Second change straight engine > > oil (Shell 5W-40 Rotella-T). I'll make > the > > next change using > > Marvel Mystery Oil. I've never used MM Oil before. > How > > much > > can I safely put in the engine of this 83 650, or just follow > directions > > on> > can? Will it hurt anything if I continue to "soup up" the > > > engine oil > > at each change with MM Oil no matter how long it takes > > > to stop the tappet > noise? > > If I change oil at say 300 to 500 > > miles the next several> times do > > I need to change the oil filter> too > > or can I skip to every > > > > > other change while > > > working on this problem? I'm going to give the > engine > > every > > opportunity to purge it's little gremlins before taking more > drastic> > > > measures like pulling the cylinder head cover. But, I'm collecting > > > some > > spare > > ... > > read more » --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. 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