Wanted: UK Jupiter S3 cylinder head...

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jondowning
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Joined: Tue Apr 04, 2006 11:13 pm
Location: Sheffield, Yorkshire

Wanted: UK Jupiter S3 cylinder head...

Post by jondowning »

A crack has been detected in the left hand (ie as you look under the bonnet) cylinder head on my RHD 1953 Jupiter mk 1 (S3 engine). So, has anyone got a spare, please? Or what experiences can anyone share regarding repairs?

Thanks
Former guardian of e3/sa/934 jowett jupiter mark 1
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Keith Clements
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Post by Keith Clements »

Where is it cracked? If it is cracked across the valve seats, new seats should fix it. I think Jowett Car Spares have some heads.
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jondowning
Posts: 35
Joined: Tue Apr 04, 2006 11:13 pm
Location: Sheffield, Yorkshire

Post by jondowning »

Investigations when I acquired the car showed it to be a very late S3. I've decided to go the 'repair' route, the heads offered sounded like they weren't much better than the one already in place, and at least I know the rest of this one works!
Former guardian of e3/sa/934 jowett jupiter mark 1
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jondowning
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Joined: Tue Apr 04, 2006 11:13 pm
Location: Sheffield, Yorkshire

Post by jondowning »

repair (weld & new valve seat, etc) seems to have worked: whilst off the road, water pump was also repaired, and electronic ignition fitted ...
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Forumadmin
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Post by Forumadmin »

Enjoy!
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jondowning
Posts: 35
Joined: Tue Apr 04, 2006 11:13 pm
Location: Sheffield, Yorkshire

Post by jondowning »

oh dear

valve seats have come adrift again :-( [in fact this is the third time, there was an unreported occurrence 1500 miles ago ...]

my mechanic is now advising a replacement cylinder head rather than repair. I haven't seen the offending items, so can't comment.

So, as per previously (and before I contact the spares guys next Monday evening) ... does anybody out there have a 'clean' cylinder head going spare .. or come to that, a rebuilt engine?

Thanks for looking! [Contact number hidden in my profile, if anyone has any news]
Former guardian of e3/sa/934 jowett jupiter mark 1
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Forumadmin
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Post by Forumadmin »

My valve seats were further fixed with some allen screws so did not rely on interference fit.
The problem these days is finding a head that has nothing wrong with it. I suspect that cracks, blockages, thinness, warping, too much grinding on face or combustion chambers, loose core plugs, valve guide wear, ... have taken their toll.
If there was nothing else wrong it should be easier to fit a replacement seat I would think. Better the devil you know.
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