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Author Topic: Valve won't seat!  (Read 5303 times)

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Andy B

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Re: Valve won't seat!
« Reply #30 on: 13 March 2017, 20:04:31 »
Quote from: Bigron on 13 March 2017, 19:59:08
....
Slightly off topic, but when I eventually get around to rebuilding my Sunbeam S8 motorbike, I will need to have harder valve seats installed to cope with unleaded petrol  ....

IMHO that is a task that can be done if the head ever comes off for some other reason. I assume the bike will have limited use, so valve seat recession will be a longtime in happening.   :y
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Bigron

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Re: Valve won't seat!
« Reply #31 on: 13 March 2017, 20:24:54 »
Tee hee - the head is already off, as are most other things! The bike is in its component parts and buried in my garage, waiting for my loving care and attention..... :-[

Ron.
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Marks DTM Calib

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Re: Valve won't seat!
« Reply #32 on: 13 March 2017, 20:29:34 »
Well worth doing if the heads off, we pay about 200 notes for the likes of a land rover engine but that includes all the labour and a complete rebuild
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Bigron

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Re: Valve won't seat!
« Reply #33 on: 13 March 2017, 20:33:35 »
I would be doing the rebuilding myself and I don't charge me Land Rover prices! It's only a 500cc twin cylinder engine - any idea of cost just for new, hardened seats?

Ron.
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Andy B

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Re: Valve won't seat!
« Reply #34 on: 13 March 2017, 20:37:21 »
Quote from: Bigron on 13 March 2017, 20:24:54
Tee hee - the head is already off, as are most other things! The bike is in its component parts and buried in my garage, waiting for my loving care and attention..... :-[

Ron.

I had a Bond Bug like that. After it'd sat in my garage for 'a long time' I decided it was never going to happen & got rid.  :-X
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Bigron

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Re: Valve won't seat!
« Reply #35 on: 13 March 2017, 20:41:38 »
Oh no, I am DEFINITELY going to rebuild the bike.....when I get a Round Tuit!  ::)

Ron.
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Entwood

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Re: Valve won't seat!
« Reply #36 on: 13 March 2017, 20:45:42 »
Quote from: Bigron on 13 March 2017, 20:41:38
Oh no, I am DEFINITELY going to rebuild the bike.....when I get a Round Tuit!  ::)

Ron.

Here you are ..



Your Wish is granted .. now get on with it ....   :)  :)

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Bigron

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Re: Valve won't seat!
« Reply #37 on: 13 March 2017, 20:53:09 »
Thanks Nige - I knew somebody would oblige!  :y 8)

Ron.
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Nick W

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Re: Valve won't seat!
« Reply #38 on: 13 March 2017, 21:08:38 »
Quote from: Bigron on 13 March 2017, 19:59:08
Slightly off topic, but when I eventually get around to rebuilding my Sunbeam S8 motorbike, I will need to have harder valve seats installed to cope with unleaded petrol - unless anyone has experience of the lead supplement that I hear you can get for the petrol?
Or maybe there is a petrochemical expert in the forum who can tell me how to treat the petrol to be like leaded?



If the head is aluminium, then it must have hardened valve seats. These will be good enough for unleaded fuel. A good solvent cleaner will show the edges if you have doubts. Simple.
If it's cast iron, then it might be good enough. I put 50,000 miles on a Pinto without hardened seats without a problem. 4,000 miles on a Cologne V6 created such valve seat recession that it barely ran. Neither case is unusual. Lead replacement additives are still available, and considering that you're unlikely to do more than a few thousand miles on an old motorbike(for the rest of your life ;) ) will be all you need.
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Field Marshal Dr. Opti

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Re: Valve won't seat!
« Reply #39 on: 13 March 2017, 21:11:34 »
Quote from: Andy B on 13 March 2017, 20:37:21
Quote from: Bigron on 13 March 2017, 20:24:54
Tee hee - the head is already off, as are most other things! The bike is in its component parts and buried in my garage, waiting for my loving care and attention..... :-[

Ron.

I had a Bond Bug like that. After it'd sat in my garage for 'a long time' I decided it was never going to happen & got rid.  :-X

Good looking car for a 'plastic pig'

A young stud about town was far more likely to pull in a bright orange Bug than a Reliant Regal. :y
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Bigron

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Re: Valve won't seat!
« Reply #40 on: 13 March 2017, 21:20:16 »
The head IS aluminium, Nick, as is the block. So the seats will already be hardened. That's good to know; saves a few pennies on replacement.
I don't anticipate marathon coast-to-coast rides on it, likely just gentlemanly pottering about - it's hardly a boy-racer's bike!  ::)

Ron.
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Marks DTM Calib

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Re: Valve won't seat!
« Reply #41 on: 13 March 2017, 21:26:39 »
Aluminium heads on an engine do not in anyway guarantee hardened exhaust valve seats sadly.....as many Rover V8 owners will be able to confirm sadly
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Bigron

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Re: Valve won't seat!
« Reply #42 on: 13 March 2017, 21:31:39 »
Is there an easy way to tell for sure if they are hardened or not? Mind you, as Nick has said, my likely annual mileage means that it won't be a big worry.....

Ron.
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Nick W

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Re: Valve won't seat!
« Reply #43 on: 13 March 2017, 21:41:30 »
Quote from: Marks DTM Calib on 13 March 2017, 21:26:39
Aluminium heads on an engine do not in anyway guarantee hardened exhaust valve seats sadly.....as many Rover V8 owners will be able to confirm sadly


That is not what the many Rover V8 owners I know say: you'll be suffering from knackered cams/followers/bores/ other low oil pressure related faults long before the valve seats fail. I read a letter from a manufacturer of valve seats some years ago, he reckoned that they had never(since the thirties!) sold a valve seat that wasn't suitable for unleaded fuel.
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Bigron

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Re: Valve won't seat!
« Reply #44 on: 13 March 2017, 21:45:20 »
You do know how to confuse me!  :-\ ???

Ron.
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