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| 1275 Head Markings? https://www.ausmini.com/forums/viewtopic.php?f=2&t=87550 |
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| Author: | Minimadmarty [ Thu Oct 23, 2014 6:09 pm ] |
| Post subject: | 1275 Head Markings? |
I brought a 1275 head today and was hoping the gurus on here could please translate/identify the marking? (I also brought a SC12 Supercharger with HIF44 and mounting brackets  )The first two: MOWOG AEG 163 & 25C  The third and forth: WT stamped and the cast W or M in a diamond  And last on the rear underneath the thermostat housing what looks like a casted F  Cheers in advance
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| Author: | TK [ Thu Oct 23, 2014 6:15 pm ] |
| Post subject: | Re: 1275 Head Markings? |
Cooper S Mk 1 |
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| Author: | Minimadmarty [ Thu Oct 23, 2014 6:50 pm ] |
| Post subject: | Re: 1275 Head Markings? |
TK wrote: Cooper S Mk 1 Cheers TK, that's great news (luckily I have a block with the matching 11 holes) Which of the marking identify that? Any idea of the other markings? |
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| Author: | Mick [ Thu Oct 23, 2014 6:55 pm ] |
| Post subject: | Re: 1275 Head Markings? |
The AEG163 number is all you need. It is a very specific number used on early Cooper S engines until the beginning of the Mk2 Coopers in 69. Prone to cracking, and worth a fair chunk of money if non-cracked. Well worth having it tested and putting it aside whatever the result. |
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| Author: | drmini in aust [ Thu Oct 23, 2014 6:56 pm ] |
| Post subject: | Re: 1275 Head Markings? |
Minimadmarty wrote: TK wrote: Cooper S Mk 1 Cheers TK, that's great news (luckily I have a block with the matching 11 holes) Which of the marking identify that? Any idea of the other markings? The AEG163. Check it carefully for cracks between the inlet & exhaust seats... |
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| Author: | Minimadmarty [ Thu Oct 23, 2014 7:06 pm ] |
| Post subject: | Re: 1275 Head Markings? |
Mick wrote: Prone to cracking, and worth a fair chunk of money if non-cracked. Well worth having it tested and putting it aside whatever the result. drmini in aust wrote: Check it carefully for cracks between the inlet & exhaust seats... What's the best way to test/check it? Will my local machine shop be my best bet? Cheers guys |
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| Author: | Mick [ Thu Oct 23, 2014 7:32 pm ] |
| Post subject: | Re: 1275 Head Markings? |
Yes, engine machine shops will specialise in crack testing |
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| Author: | Minimadmarty [ Thu Oct 23, 2014 7:53 pm ] |
| Post subject: | Re: 1275 Head Markings? |
Mick wrote: Yes, engine machine shops will specialise in crack testing Cheers Mick, I shall drop it in to my local shop first thing in the morrow If it passes I'll get them to reseat the valve. Which leads me to a secondary set of questions! All the hard wear came in an ice cream tub (valve, springs etc) the valve have been labelled one through to eight, does it matter which order they go back in and assuming the guy who label them (unfortunately no longer with us to ask!) labelled them correctly, would one be at the thermostat end or the other end? Plus, is it worth replacing the springs and guides as a matter of course? |
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| Author: | Mick [ Thu Oct 23, 2014 7:57 pm ] |
| Post subject: | Re: 1275 Head Markings? |
Line the springs up on a table from 1 through to 8 and note how much they differ in height, and then ask yourself if you know what the original height was anyway and how much they've lost tension. If they're different, then each valve will behave slightly differently, and you may get bounce without expecting to. You can lay a ruler across the top to really see the height difference in the old springs. Luckily if they're way off, they're pretty cheap and easy to replace. |
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| Author: | timmy201 [ Fri Oct 24, 2014 11:04 am ] |
| Post subject: | Re: 1275 Head Markings? |
Mick wrote: The AEG163 number is all you need. It is a very specific number used on early Cooper S engines until the beginning of the Mk2 Coopers in 69. Prone to cracking, and worth a fair chunk of money if non-cracked. Well worth having it tested and putting it aside whatever the result. If it is in good condition, it might be worth your while to sell/swap it to someone for a 12G940, as a good AEG 163 is hard to find... |
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| Author: | Minimadmarty [ Fri Oct 24, 2014 11:39 am ] |
| Post subject: | Re: 1275 Head Markings? |
timmy201 wrote: If it is in good condition, it might be worth your while to sell/swap it to someone for a 12G940, as a good AEG 163 is hard to find... I'm in two minds, if it's good I'd love to recondition it and place it on my motor so next time I'm asked if my Leyland Mini is a Cooper S I can say parts of it are! But then it would be good to see it back on a genuine Mk1 Cooper S in need of a new head! First thing first, getting it tested 
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| Author: | Mick [ Fri Oct 24, 2014 11:42 am ] |
| Post subject: | Re: 1275 Head Markings? |
Yes, there's little to gain other than by name. The same valves can be fitted to the much cheaper, easier to get and reliable 12940 head. Even the extra holes is simple to perform with even a small drill press to hold the drill bit vertical. The iron is very easy to drill. The value is in the provenance of the head as cooper not so much in what performance gains it can offer. The brazed bypass hose is interesting, does it look modified elsewhere? |
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| Author: | Minimadmarty [ Fri Oct 24, 2014 12:01 pm ] |
| Post subject: | Re: 1275 Head Markings? |
Mick wrote: Line the springs up on a table from 1 through to 8 and note how much they differ in height, and then ask yourself if you know what the original height was anyway and how much they've lost tension. If they're different, then each valve will behave slightly differently, and you may get bounce without expecting to. You can lay a ruler across the top to really see the height difference in the old springs. As you can see there is a very slight variation in heights! If it passes the crack testing I might order new springs (lined up in order from one to eight with one to the left)  
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| Author: | Minimadmarty [ Fri Oct 24, 2014 12:06 pm ] |
| Post subject: | Re: 1275 Head Markings? |
Mick wrote: The value is in the provenance of the head as cooper not so much in what performance gains it can offer. The brazed bypass hose is interesting, does it look modified elsewhere? Yes, I agree Mick the value is in the provenance I would much prefer to see it as it was intended, sat under the bonnet of a genuine Mk1. As for it being modified I'm merely a novice still learning so don't know what to look for! |
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