Could this be the problem
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Re: Could this be the problem
Evening all, just thought I'd give you an update. Unfortunately the Indian rope trick didn't work in my favour, maybe I was too cautious or was doing it wrong! Anyway decided to take the head off to get a good look-see. Whilst I'm at this stripped stage is there anything else I should do? Please take into consideration that my talent is limited but I'm very enthusiastic and want to learn.
Regards Paul
Regards Paul
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Re: Could this be the problem
Was the valve stuck open?
You could check for valve guide wear but probably not necessary if the zorst hasn't been producing blue (oily) smoke.
As it's the inlet valve that appeared to be stuck open it's unlikely to be due to carbon coke build-up on the stem behind the valve head (more likely on the zorst valve) but you'll need to ascertain the cause or it's likely to stick again. Maybe the inlet valve oil metering screw needs to be opened a bit more or its oil feed drilling is obstructed.
If the old copper cyl head gasket isn't damaged you can re-use it but you must anneal (soften) it first - same with a new gasket.
I'd strongly recommend that you replace the top pushrod seals with Viton 'O' rings. I think I used 3 on each pushrod on my '54 G3LS. but it'll be pretty obvious when you trial fit the cyl head. They are available from club spares dep't.
https://www.amoc-parts.com//store/comer ... duct=24102
The reason for using the Viton seals and further guidance is in this thread:
viewtopic.php?t=8963&start=10
Before you replace the rocker box check that there isn't compressed crud/debris at the bottom of the blind threaded rocker box bolt holes in the cyl head. If there's crud at the bottom (old gasket scrapings etc) of those holes the rocker cover bolts will feel tight but won't have pinched the gasket tightly enough to prevent oil leaking out of the r/box to cyl head joint. It's quite common for owners try to tighten the bolts more in an effort to stop the leak and strip the the threads in the ali cyl head.
You could check for valve guide wear but probably not necessary if the zorst hasn't been producing blue (oily) smoke.
As it's the inlet valve that appeared to be stuck open it's unlikely to be due to carbon coke build-up on the stem behind the valve head (more likely on the zorst valve) but you'll need to ascertain the cause or it's likely to stick again. Maybe the inlet valve oil metering screw needs to be opened a bit more or its oil feed drilling is obstructed.
If the old copper cyl head gasket isn't damaged you can re-use it but you must anneal (soften) it first - same with a new gasket.
I'd strongly recommend that you replace the top pushrod seals with Viton 'O' rings. I think I used 3 on each pushrod on my '54 G3LS. but it'll be pretty obvious when you trial fit the cyl head. They are available from club spares dep't.
https://www.amoc-parts.com//store/comer ... duct=24102
The reason for using the Viton seals and further guidance is in this thread:
viewtopic.php?t=8963&start=10
Before you replace the rocker box check that there isn't compressed crud/debris at the bottom of the blind threaded rocker box bolt holes in the cyl head. If there's crud at the bottom (old gasket scrapings etc) of those holes the rocker cover bolts will feel tight but won't have pinched the gasket tightly enough to prevent oil leaking out of the r/box to cyl head joint. It's quite common for owners try to tighten the bolts more in an effort to stop the leak and strip the the threads in the ali cyl head.
Last edited by SPRIDDLER on Mon Jan 16, 2023 8:54 pm, edited 1 time in total.
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Re: Could this be the problem
A pic may help.
I've mentioned 3 'O' rings but it may need 4 (I can't remember - I'm old) as mentioned in my post above.
You only need washers 'B' and 'C'. The steel washer 'B' is usually well stuck in the cyl head so check thoroughly.
I've mentioned 3 'O' rings but it may need 4 (I can't remember - I'm old) as mentioned in my post above.
You only need washers 'B' and 'C'. The steel washer 'B' is usually well stuck in the cyl head so check thoroughly.
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'There is a tide in the affairs of men
Which taken at the flood............'
Which taken at the flood............'
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Re: Could this be the problem
Thanks Spriddler, I'll get some O Rings added to my order.
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Re: Could this be the problem
Gave the piston a quick wipe.
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Re: Could this be the problem
Afternoon all, today's update involved removing the valves for inspection. The valve springs came off relatively easy, I didn't have to use a tool, which was a bonus! Exhaust valve slipped out on it's own, but the Inlet valve was a different matter and only came out with some persuasion. Before taking it out I did notice some slight knurling to the collet/spring end of the valve but other than that the valve looks straight and was oily.
Any reasons why the Inlet valve would be so tight as I'm baffled! Both valve guides look good, to my untrained eye, with no scoring.
Silly question time but are the markings on the piston induction of standard size?
Any reasons why the Inlet valve would be so tight as I'm baffled! Both valve guides look good, to my untrained eye, with no scoring.
Silly question time but are the markings on the piston induction of standard size?
Last edited by PX207 on Tue Jan 17, 2023 3:59 pm, edited 1 time in total.
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Re: Could this be the problem
On another note, not sure what type of sealant this is on the pushrod covers, but I don't think it should be there. A good clean before refitting with new seals me thinks
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- clive
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Re: Could this be the problem
I suspect that is red hermatite, used to be my go to sealant but it does tend to go hard, especially with some heat. It could well be it was used because the correct dished washer C above was missing.
clive
if it ain't broke don't fix
if it ain't broke don't fix
- jackstringer
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Re: Could this be the problem
Oh you have a DPO that was a Hermatitist.
Some people go a bit mad with the stuff so it's worth checking the oil ways etc. Use an airline to check some if the ones in the head.
I remember spending house scraping off lots of excess red stuff and using proper seals and gaskets to seal it up, just with the odd slither to help hold it in place.
Some people go a bit mad with the stuff so it's worth checking the oil ways etc. Use an airline to check some if the ones in the head.
I remember spending house scraping off lots of excess red stuff and using proper seals and gaskets to seal it up, just with the odd slither to help hold it in place.
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Re: Could this be the problem
That sounds like the stuff! Although the dished washer was in place, as well as the big rubber seal, which wasn't in good shape.