NO, none at all. The adjuster has an internal spring that holds up the cam follower and the oil inside acts to dampen the assembly when it is in motion. I don't have a picture of this but I'll try to describe it. The adjuster sits off the side of the cam opposite the valve. One end of the cam follower rests on the adjuster and the follower passes under the cam and on to the valve. The cam presses down on the follower and depresses the valve while the adjuster maintains zero clearance between the cam and valve. OK with that ? Being as it's not a lifter, the bike can rev to 10K+ When the adjuster fails or loses oil pressure they lose dampening and clatter. The pressure applied to the cam is not so great as cause scarring but damage can result from excessive clearance. IMHO; I don't really care for this layout. It's still a rocker arm design to me. Yes, the cams are in the head but the best of all was the family of motors (CB750,900, CBX) that operated the valves directly by the lobes pushing down on them. Clearance adjusted by shims in buckets over the valve springs. NO side thrust on the valve stems in that design. Fewest number of moving parts too. The idea was discarded in favor of a low-maintenance engine. I might add that was at the direction of S. Honda himself. He was obsessed at making a motorcycle that required as little attention as a Chevrolet. So, the Hawks we love can be traced back to an idea from the founder himself. The earlier design was lifted from European engineering.
--- On Sat, 3/14/09, stanley/ Randolph <[email protected]> wrote: From: stanley/ Randolph <[email protected]> Subject: [Nighthawk Lovers] Re: 650 engine noise To: [email protected] Date: Saturday, March 14, 2009, 11:27 PM This question is for Dennis H: are there not adjusting screws of some sort, even though the lifters are hydraulic? Or is it pre - set, like some of the later car engines I worked on before I stopped? I had to adjust the rockers on my 550 Four. Stanley From: "[email protected]" <[email protected]> To: [email protected] Sent: Saturday, March 14, 2009 11:28:54 AM Subject: [Nighthawk Lovers] Re: 650 engine noise In the manual they say : don't mix them up, if taking them out. They must be carefully paired with their corresponding hole. At 17:16 13/03/2009 -0700, you wrote: >According the the previous owner the engine was never opened before >but based on some scratches on the frame I do wonder. > >If air gets in a hydraulic tappet will it work its way out eventually? >I suspect not based on the cross section of a tappet displayed in the >shop manual. But, if there was air in a tappet wouldn't it collapse >each time the valve opens/closes which means the tappet would always >be noisy. In my bike's case the tappets do quiet down eventually. > >Is it possible to check these things visually, i.e. can I "rock" a >rocker arm and assume any that are loose have a bad/leaking tappet >under them. I would assume all of them should be tight against the >valve stem when the valve is closed and the cam lobe is at the >shortest radius to rocker distance. In other words when the valve >train is in it's most relaxed state for that valve. Even if I found a >couple bad ones with some sort of visual inspection I'd probably take >'em all out and clean and bleed 'em if that's prudent. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Nighthawk Motorcycle Lovers!" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/nighthawk_lovers?hl=en -~----------~----~----~----~------~----~------~--~---
