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rebuilding head #755169
11/05/18 7:20 pm
11/05/18 7:20 pm
Joined: Sep 2016
Posts: 175
County Durham
D
ducati2242 Offline OP
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ducati2242  Offline OP
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Joined: Sep 2016
Posts: 175
County Durham
After a dropped valve last weekend I have to fit a new inlet valve , valve guide , collets , etc . Decided to do the same to the exhaust valve and have the seals re-cut . Found all the parts and have them on order but under the exhaust valve shim , the flat machined washer under the spring , there's a tight fitting inch and a quarter o.d. 16th inch thick fiber washer . It is a tight fit on the valve guide . I cant find any reference to this and was wondering if it was supposed to be there and if so why isn't there one under the inlet valve shim .
It looks like a faulty collet was the cause of the valve to drop there's a small indentation to the piston but it is otherwise fine .

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Re: rebuilding head [Re: ducati2242] #755182
11/05/18 8:35 pm
11/05/18 8:35 pm
Joined: Sep 2016
Posts: 175
County Durham
D
ducati2242 Offline OP
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ducati2242  Offline OP
BritBike Forum member
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Joined: Sep 2016
Posts: 175
County Durham
Ive found out the answer to my question as to why theres only one fibre washer and ive even managed to by a set from eBay . Heat transfer so there you go . Back to waiting for parts .
[Linked Image]

Re: rebuilding head [Re: ducati2242] #755227
11/06/18 6:17 am
11/06/18 6:17 am
Joined: Feb 2011
Posts: 3,535
Orygone
Boomer Offline

BritBike Forum member
Boomer  Offline

BritBike Forum member

Joined: Feb 2011
Posts: 3,535
Orygone
Tufnol washer.


Bill B...


Boomer
Re: rebuilding head [Re: ducati2242] #755332
11/07/18 5:02 pm
11/07/18 5:02 pm
Joined: Aug 2001
Posts: 4,190
argyll. scotland, uk
gavin eisler Offline
BritBike Forum member
gavin eisler  Offline
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Joined: Aug 2001
Posts: 4,190
argyll. scotland, uk
The tufnol washer prevents heat transfer to the exhaust valve spring by insulating it from the head.
its mentioned in the "Goldie " by A Golland.


71 Devimead A65 750
56 Norbsa 68 Longstroke A65
Cagiva Raptor 650
MZ TS 250
The poster formerly known as Pod
Re: rebuilding head [Re: ducati2242] #755441
11/08/18 6:08 pm
11/08/18 6:08 pm
Joined: Nov 2016
Posts: 49
NY State
N
NYBSAGUY Online content

BritBike Forum member
NYBSAGUY  Online Content

BritBike Forum member
N

Joined: Nov 2016
Posts: 49
NY State

Sorry to hear you're having to rebuild your head. On the other hand, you needed a project, heading into an east Pennine winter, now didn't you!

Our old friend Phil Pearson should have everything you need, and I know you've had a good experience with him when you were building this bike.

Good luck, and keep us posted on your progress.


1949 BSA ZB34 'Bitsa'
1959 BSA DBD34 Catalina
1973 Norton Commando 850 R
1974 Norton Commando 850 R (I know, one too many)
1998 Montesa HRC Trials
2004 Ducati M1000ie
Re: rebuilding head [Re: NYBSAGUY] #755519
11/09/18 11:32 am
11/09/18 11:32 am
Joined: Sep 2016
Posts: 175
County Durham
D
ducati2242 Offline OP
BritBike Forum member
ducati2242  Offline OP
BritBike Forum member
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Joined: Sep 2016
Posts: 175
County Durham
Originally Posted by NYBSAGUY

Sorry to hear you're having to rebuild your head. On the other hand, you needed a project, heading into an east Pennine winter, now didn't you!

Our old friend Phil Pearson should have everything you need, and I know you've had a good experience with him when you were building this bike.

Good luck, and keep us posted on your progress.


Yes these things happen . Actually it serves me right . The head was purchased as reconditioned and did have new valves , old springs , and as it turns out the wrong valve collets . Had I taken it apart I would have noticed but unfortunately I didn't . Learnt a lesson there don't trust anyone else's work . Check it properly .

Re: rebuilding head [Re: ducati2242] #756260
Yesterday at 03:18 PM
Yesterday at 03:18 PM
Joined: Sep 2016
Posts: 175
County Durham
D
ducati2242 Offline OP
BritBike Forum member
ducati2242  Offline OP
BritBike Forum member
D

Joined: Sep 2016
Posts: 175
County Durham
All fixed. Started second kick and sounds better than ever . I decided to renew the piston and went with an omega 20 thou oversize I had it bored to 2 thou clearance and it sounds so much quieter . The first valves I got were terrible so returned them and got some very nice old stock originals . New collets and holders and I honed the collets to fit properly . Will run it in carefully but doubt it will be spring before its on the road as it has already snowed once and its forecast to come properly soon .


Moderated by  Rich B 


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