FAQ  •  Register  •  Login

Bent Valve ?

Moderators: Curt!, Pa

<<

h.d.ryder

Posts: 287

Joined: Sun Nov 10, 2002 1:01 am

Location: Cranbrook B.C. Canada

Post Thu Jul 12, 2012 8:33 pm

Bent Valve ?

The knuck started missing ,so I managed to limp it home.I kicked it over ,it has zero comp.in frt.cyl. I checked valve adj. frt ex.push rod is loose and it won`t adjust ,threaded adjuster is all the way out of tappet and it doesn`t touch pushrod. Valve must be bent ,I`ll do a leakdown tomorrow.
Then I`ll pull both heads and check everything on both heads.
I also removed the top tins from both rocker covers on frt.head..
I can`t detect any endplay on rocker shafts and frt.rocker is very stiff .I have to pry it with screwdriver to make it move up and down away from spring retainer.
I know that rubber seal gives it some resistance ,but this is extremely tight.
Pushrods are not bent ,and rollers on tappets are good.
Maybe this caused a valve to stick ? Also maybe valve too tight in guide?
Any ideas ?
Thanks in advance.
<<

h.d.ryder

Posts: 287

Joined: Sun Nov 10, 2002 1:01 am

Location: Cranbrook B.C. Canada

Post Mon Jul 16, 2012 11:01 pm

Re: Bent Valve ?

I finally got a chance to work on my Knuck ,I removed the frt.head tonite ,someone installed new valves ,and guides and new rocker shafts ,seems to be no clearance on frt.guide and valve is seized in guide ,partly stuck open. Had to drift it out with a hammer.
Intake valve is not seized ,but is very tight with not very much clearance.
After I get this all sorted out ,I will be checking the rear head as well.
<<

Chris Haynes

Posts: 2631

Joined: Wed Jul 05, 2000 12:01 am

Location: Los Angeles, CA

Post Tue Jul 17, 2012 9:45 am

Re: Bent Valve ?

Who built the heads? Hopefully they are cast iron guides.
<<

h.d.ryder

Posts: 287

Joined: Sun Nov 10, 2002 1:01 am

Location: Cranbrook B.C. Canada

Post Tue Jul 17, 2012 7:15 pm

Re: Bent Valve ?

Not sure who built the heads ,Previous owner had a reputable expert build the engine . Maybe he was an expert on Evo`s or something other than Knucks ?
Yes ,they are cast iron guides .
<<

Chris Haynes

Posts: 2631

Joined: Wed Jul 05, 2000 12:01 am

Location: Los Angeles, CA

Post Tue Jul 17, 2012 10:05 pm

Re: Bent Valve ?

Sounds like something easily fixed with a guide reamer.
<<

fhsmith1

Posts: 205

Joined: Wed Jul 26, 2006 6:10 pm

Location: Georgia

Post Thu Jul 19, 2012 3:12 pm

Re: Bent Valve ?

I have been running Kibblewhite bronze guides. Guides have about 15000 miles. They seem to work OK. What problems are associated with them?
<<

h.d.ryder

Posts: 287

Joined: Sun Nov 10, 2002 1:01 am

Location: Cranbrook B.C. Canada

Post Sun Aug 12, 2012 10:35 pm

Re: Bent Valve ?

Just an update on my seized valve;
I took both heads apart ,honed the guides to proper clearance ,replaced one valve and set up the rocker arm end-play.
I been riding it for a couple weeks now ,it starts good and runs nice and has good power on the highway.
I`m real happy with it ,It`s a keeper!

Return to Knuckles

Who is online

Users browsing this forum: No registered users and 1 guest

Powered by phpBB © 2000, 2002, 2005, 2007, 2012 phpBB Group.