Head Part ID
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Head Part ID
Hi Gang
Would anyone help me to identify the circled part on my cylinder head please?
I've had no luck finding it on ESM and on Moss I "think" it's the "adapter bypass hose", item 90 on the exploded head diagram image.
Does it just screw out anticlockwise?
Thank you kind folks, after some months of laziness I want to start making some progress again so help would be appreciated please.
Would anyone help me to identify the circled part on my cylinder head please?
I've had no luck finding it on ESM and on Moss I "think" it's the "adapter bypass hose", item 90 on the exploded head diagram image.
Does it just screw out anticlockwise?
Thank you kind folks, after some months of laziness I want to start making some progress again so help would be appreciated please.
1961 Morris Minor 1000
- svenedin
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Re: Head Part ID
Yes it's for the bypass hose. I believe it does screw out but be careful you don't snap it. I'd soak it for several days in PlusGas before trying!
You can use the original length part or a longer part which means a new bypass hose can be fitted more easily without removing the cylinder head.
https://www.bullmotifminispares.co.uk/p ... 75/12A2075
https://oldskoolminis.co.uk/shop/classi ... 275-3gh16/
You can use the original length part or a longer part which means a new bypass hose can be fitted more easily without removing the cylinder head.
https://www.bullmotifminispares.co.uk/p ... 75/12A2075
https://oldskoolminis.co.uk/shop/classi ... 275-3gh16/
Last edited by svenedin on Thu Jul 13, 2023 9:54 pm, edited 1 time in total.
1969 1098cc Convertible “Xavier” which I have owned since 1989.
Stephen
Stephen
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Re: Head Part ID
Here it is on the ESM site
https://www.morrisminorspares.com/cooli ... ad-p829613
As Stephen says, soak it in releasing fluid or use heat
https://www.morrisminorspares.com/cooli ... ad-p829613
As Stephen says, soak it in releasing fluid or use heat
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Re: Head Part ID
No need to remove the cylinder head just remove the water pump which is much simpler.
- svenedin
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Re: Head Part ID
That's much easier and if the bypass hose has failed it may well be time to check the condition of the water pump.....philthehill wrote: ↑Thu Jul 13, 2023 10:38 pm No need to remove the cylinder head just remove the water pump which is much simpler.
1969 1098cc Convertible “Xavier” which I have owned since 1989.
Stephen
Stephen
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Re: Head Part ID
This is one of the bypass hose adapters used, originally supplied by Mull Motif and which has a hexagon for tightening and undoing. In my opinion this is the best bypass hose adapter and can easily be removed with the head in place.
https://www.ebay.co.uk/itm/363686649697 ... R6SfrJSqYg
As an aside - that blanking plug for the head horizontal oil gallery is not standard. I would check to make sure all is correct.
Make sure that you use the correct 5/8" x 16 TPI tap to clean up the threads. The threads are not 5/8" x 18 TPI UNF as specified by some suppliers.
This is the other type of bypass hose adapter but the screw driver slot (if fitted) is useless when trying to remove the bypass hose adapter from the head.
Here is the correct tap for the bypass adapter. It also suits the crankshaft starter dog/bolt. The tap listed is a good price. I paid considerably more for the tap featured in the photo above.https://www.ebay.co.uk/itm/363686649697 ... R6SfrJSqYg
As an aside - that blanking plug for the head horizontal oil gallery is not standard. I would check to make sure all is correct.
Re: Head Part ID
Thanks gents, very helpful as always.
I think the hex nut option is the best replacement, even though I doubt I'll ever need to take it off again.
The head is a 12G202, not the original for the block. I noticed the plug too but have no idea why it's there.
I think the hex nut option is the best replacement, even though I doubt I'll ever need to take it off again.
The head is a 12G202, not the original for the block. I noticed the plug too but have no idea why it's there.
1961 Morris Minor 1000
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Re: Head Part ID
The plug is there to block the horizontal oil gallery which feeds up to the rocker shaft.
The plug should be brass. I suspect that someone has removed the original brass plug to examine or unblock the gallery.
If it not leaking I would leave well alone.
The plug should be brass. I suspect that someone has removed the original brass plug to examine or unblock the gallery.
If it not leaking I would leave well alone.
Re: Head Part ID
I bought one of the hex-type adapters from Bull Motif but they actually sent a one without a hex-nut! Apparently they have been misleading people for 3-years by showing a hex-nut image on their website but sending items with the slot. Not impressed with them.svenedin wrote: ↑Thu Jul 13, 2023 9:50 pm Yes it's for the bypass hose. I believe it does screw out but be careful you don't snap it. I'd soak it for several days in PlusGas before trying!
You can use the original length part or a longer part which means a new bypass hose can be fitted more easily without removing the cylinder head.
https://www.bullmotifminispares.co.uk/p ... 75/12A2075
https://oldskoolminis.co.uk/shop/classi ... 275-3gh16/
1961 Morris Minor 1000
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Re: Head Part ID
There doesn't appear to be a copper washer fitted which, according to someone in a different subject, wrote that a parallel thread has to have one!
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Re: Head Part ID
A washer is not required, just screw it in and tighten.
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Re: Head Part ID
Following up on this thread for the interest of anyone interested....
I put the head in to a local engineering place about 3-weeks ago. A good lad who has a workshop full of expensive machines, a Lola racing car and a Lotus Europa so I think he must be somewhat familiar with English motors. Then again, the Europa has a Renault lump so maybe not.
He got the bypass adapter out for me (which I managed to make a pigs ear of with the mole grips) and changed the valve guides. Unfortunately me being a bit dim witted I failed to notice the non-original head before I bought the new valves. Meaning I have a set of valves for a 950cc head which are too small for the 1098 head I gave him.
I took the old valves to him yesterday and he said that he'll try and see if they can be worked on to be re-used. They were a bit pitted as shown in another thread I put on here a while ago and the end of the stem may be damaged due to angle of the rocker not pushing directly downwards on them. I'd never have thought about that myself. If they can't be machined then I'll be buying some new ones next month.
I did buy a cheap 12A1456 head the other day anyway so I will at least have new valves for that when the time comes.
I put the head in to a local engineering place about 3-weeks ago. A good lad who has a workshop full of expensive machines, a Lola racing car and a Lotus Europa so I think he must be somewhat familiar with English motors. Then again, the Europa has a Renault lump so maybe not.
He got the bypass adapter out for me (which I managed to make a pigs ear of with the mole grips) and changed the valve guides. Unfortunately me being a bit dim witted I failed to notice the non-original head before I bought the new valves. Meaning I have a set of valves for a 950cc head which are too small for the 1098 head I gave him.
I took the old valves to him yesterday and he said that he'll try and see if they can be worked on to be re-used. They were a bit pitted as shown in another thread I put on here a while ago and the end of the stem may be damaged due to angle of the rocker not pushing directly downwards on them. I'd never have thought about that myself. If they can't be machined then I'll be buying some new ones next month.
I did buy a cheap 12A1456 head the other day anyway so I will at least have new valves for that when the time comes.
1961 Morris Minor 1000
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Re: Head Part ID
Thanks (from all the forum) for the up-date.
One careful step forward at a time is better than one step forward and two steps back! Ask about the detail if not totally sure, before buying parts, etc, and you will get help to point you in the right direction quite quickly.
At least your posting might help others and prevent them making mistakes, so well done. You are progressing now.
One careful step forward at a time is better than one step forward and two steps back! Ask about the detail if not totally sure, before buying parts, etc, and you will get help to point you in the right direction quite quickly.
At least your posting might help others and prevent them making mistakes, so well done. You are progressing now.
Re: Head Part ID
I've had a look on ESM and the hardened exhaust valves they sell state they are for 803/948/1098 How can they be the same size for all engines?
I suppose I'll have to call them to find out what is going on to avoid buying the wrong valves again. It could be that the seats in the head have been enlarged. The head is a 12G202 from an 1098 - just a confirmation that the standard valves are larger than the 948 would help, in case anyone knows.
I would prefer to keep the 1098 head in the hope of getting a couple of extra ponies but now I'm starting to wonder whether I should just put an original one on - that will at least set it back to an original condition.
I suppose I'll have to call them to find out what is going on to avoid buying the wrong valves again. It could be that the seats in the head have been enlarged. The head is a 12G202 from an 1098 - just a confirmation that the standard valves are larger than the 948 would help, in case anyone knows.
I would prefer to keep the 1098 head in the hope of getting a couple of extra ponies but now I'm starting to wonder whether I should just put an original one on - that will at least set it back to an original condition.
1961 Morris Minor 1000
- svenedin
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Re: Head Part ID
As far as I know the exhaust valves are the same for the 948 and 1098 but the inlet valves are NOT the same.rocco wrote: ↑Tue Oct 17, 2023 7:22 pm I've had a look on ESM and the hardened exhaust valves they sell state they are for 803/948/1098 How can they be the same size for all engines?
I suppose I'll have to call them to find out what is going on to avoid buying the wrong valves again. It could be that the seats in the head have been enlarged. The head is a 12G202 from an 1098 - just a confirmation that the standard valves are larger than the 948 would help, in case anyone knows.
I would prefer to keep the 1098 head in the hope of getting a couple of extra ponies but now I'm starting to wonder whether I should just put an original one on - that will at least set it back to an original condition.
Did you fit the valve guides with the groove for the newer "top-hat" valve stem oil seals?
Stephen
1969 1098cc Convertible “Xavier” which I have owned since 1989.
Stephen
Stephen
Re: Head Part ID
Yes Stephen, I bought the grooved guides that Phil recommended and they were fitted last week.
I will check with the mechanic again but I saw him measure and compare one of the valves and there was a visible size difference.
I will check with the mechanic again but I saw him measure and compare one of the valves and there was a visible size difference.
1961 Morris Minor 1000
- svenedin
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Re: Head Part ID
Well the 1098 inlet valves are larger than the 948 ones.
1969 1098cc Convertible “Xavier” which I have owned since 1989.
Stephen
Stephen
Re: Head Part ID
Thanks. So the exhaust valves are the exact same size? I know I should have compared and measured them myself but it just didn't register with me, even once I had identified the larger head.
1961 Morris Minor 1000