80 Valve Clatter


Re: 80 Valve Clatter

Postby EMS » Mon Aug 09, 2010 8:36 pm

Pulling the cylinder head will only allow you to easily replace the small cam chain. And you wouldn't even have to pull the head for this. Whether it needs replacement can easily be determined by following the procedure for installation and proper alignment of gears and cams. If the two chain gears don't align properly, the chain needs replacement because it is stretched. If they do align, save yourself the money, especially because you will not be able to replace the long chain driving the exhaust cam.
I would definitely check the valve seats and at least relap the valves before reinstallation. A recut of the seats maybe necessary.
To be understood is the exception
To be misunderstood is the rule.
User avatar
EMS
ICOA Member
ICOA Member
 
Posts: 9330
Images: 1704
Joined: Wed Mar 05, 2003 8:55 am
Location: North East OH, ICOA 3904

Re: 80 Valve Clatter

Postby twinegar » Mon Aug 09, 2010 8:47 pm

OK, thanks.
http://www.spookytoms.com/SpookyTom-MTRCCLSTF.html

"66CL160, 68CL125A, 68CL450, 69CL125A, 69CB750, 71CB450, 71CB500, 71CB750, 72CB350F, 72CB750, 74CB750, 75CL360, 75CB550, 75CB750, 76CB750, 79CB750, 79CBX, 79CBX, 80CBX, 82CB750, 84VF700S 05HDSPORTSTER1200ROADSTER"
User avatar
twinegar
Power Poster
Power Poster
 
Posts: 482
Images: 15
Joined: Sat Oct 13, 2007 6:10 pm
Location: Kansas City, Kansas, USA

Re: 80 Valve Clatter

Postby alimey4u2 » Tue Aug 10, 2010 4:41 am

In the light of day I was wondering if the Oldham couplers would be an issue . Seems to be a load related problem however....

Any thoughts... ?
ICOA # 656
User avatar
alimey4u2
ICOA Web Video Director
ICOA Web Video Director
 
Posts: 5093
Images: 4
Joined: Fri Aug 11, 2006 1:03 pm
Location: Uphill, WsM, United Kingdom

Re: 80 Valve Clatter

Postby EMS » Tue Aug 10, 2010 7:22 am

alimey4u2 wrote:In the light of day I was wondering if the Oldham couplers would be an issue . ... ?


I was thinking of that too... 8)
To be understood is the exception
To be misunderstood is the rule.
User avatar
EMS
ICOA Member
ICOA Member
 
Posts: 9330
Images: 1704
Joined: Wed Mar 05, 2003 8:55 am
Location: North East OH, ICOA 3904

Re: 80 Valve Clatter

Postby twinegar » Tue Aug 10, 2010 10:34 am

The couplers would be bound tightly under a load but the couplers could be what makes noise at idle. I did a rebuild of the alternator assembly to eliminate the noise to no avail and it isn't valve shims so maybe the couplers?
http://www.spookytoms.com/SpookyTom-MTRCCLSTF.html

"66CL160, 68CL125A, 68CL450, 69CL125A, 69CB750, 71CB450, 71CB500, 71CB750, 72CB350F, 72CB750, 74CB750, 75CL360, 75CB550, 75CB750, 76CB750, 79CB750, 79CBX, 79CBX, 80CBX, 82CB750, 84VF700S 05HDSPORTSTER1200ROADSTER"
User avatar
twinegar
Power Poster
Power Poster
 
Posts: 482
Images: 15
Joined: Sat Oct 13, 2007 6:10 pm
Location: Kansas City, Kansas, USA

Re: 80 Valve Clatter

Postby alimey4u2 » Tue Aug 10, 2010 5:35 pm

Oldhams couplers.... Load sensitive ?? Possible...Maybe at a resonant frequency that may comply with loading but then It's all subjective....
ICOA # 656
User avatar
alimey4u2
ICOA Web Video Director
ICOA Web Video Director
 
Posts: 5093
Images: 4
Joined: Fri Aug 11, 2006 1:03 pm
Location: Uphill, WsM, United Kingdom

Re: 80 Valve Clatter

Postby EMS » Wed Aug 11, 2010 8:55 am

Due to the changing load the cam lobes put on the drive, the cam rotation is not steady. It fluctuates, even under load. In addition, the engine rotation receives three acceleration impulses per revolution which results in an "un-uniform" angle speed of the crank and thus the cam drive. I know it sounds all like "hair-brained" theory, but I went through this at work while trying to find failure reasons for engine driven components due to miniscule speed fluctuation.
To be understood is the exception
To be misunderstood is the rule.
User avatar
EMS
ICOA Member
ICOA Member
 
Posts: 9330
Images: 1704
Joined: Wed Mar 05, 2003 8:55 am
Location: North East OH, ICOA 3904

Re: 80 Valve Clatter

Postby alimey4u2 » Wed Aug 11, 2010 1:08 pm

Makes perfect sense Mike... :idea:
ICOA # 656
User avatar
alimey4u2
ICOA Web Video Director
ICOA Web Video Director
 
Posts: 5093
Images: 4
Joined: Fri Aug 11, 2006 1:03 pm
Location: Uphill, WsM, United Kingdom

Previous

Return to ENGINES: Maintenance, Performance, Parts Sources

Who is online

Users browsing this forum: No registered users and 1 guest