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TonyOD...
TonyOD...

Posted: Fri Jan 24, 2020 3:10pm

Post Subject: BMC 1.5 cylinder head

I have seen 2 types of cylinder head for BMC 1.5D with slightly different oilways/waterways. I have not taken my head off yet but have a spare head to renovate. I don't want to do one and find it does not fit. I enclose a PDF to show difference. can anyone help

BMC 1.5 cylinder head
Tony-B...
Tony-B...

Posted: Fri Jan 24, 2020 10:11pm

Post Subject: BMC 1.5 cylinder head

The forum does not handle PDFs or any other graphics file so if you would like me to take a look send them to Tony@tb-training.co.uk but The only differences I know about are all external involving drillings for the cab heater/calorifier connection on some Indian made heads. If there were internal differn4ces it means the blocks would have to be different as well. In any case there is only one oil drilling in the head to feed the rocker gear. To be sure I suggest that you contact Calcutt Boats who seem to be the inland BMC specialists.

Tony-B...
Tony-B...

Posted: Mon Jan 27, 2020 2:01pm

Post Subject: BMC 1.5 cylinder head

3 days and as yet no PDFs emailed to me. I can only suspect that the questioner may be mixing up 1.5 and 1.8 heads because the majority of 1.8s use a different size and style of glow plugs or he has detected some external differences between UK, Turkish and Indian made heads.

Tony-B...
Tony-B...

Posted: Sat Feb 01, 2020 10:35am

Post Subject: BMC 1.5 cylinder head

As I told you the forum does not handle PDFs but as I was working on your question for the magazine I found that as soon as I copied it into a word processor the images appeared so I can now give at least a little advice. As the bosses for the glow plugs are also different I am not convinced that one head is not from a 1.8D because at a cursory glance they look identical.. I would need to see the size of glow plug holes or the actual glow plugs to be sure. There are more differences than those you ring. There are a number of other extra holes but they all appear to be for coolant. The oil hole is the same on both heads. Its the small hole at top right of each head. The fact that the heads have been manufactured in different countries over the years and it is perfectly possible 1.5 and 1.8 heads have been trans[posed at some time I think your best bet is to discuss this with Calcutt Boats who specialise in BMCs. It is even possible that the 1.5 head was modified to improve cooling during its UK production. I know direct raw water cooled 1.5s tended to burn and crack valve seats. I suspect that as long as both are 1.5 heads either will be fine for canal use but am far less sure if prolonged periods of high power may be required.

Boater-Sam...
Boater-Sam...

Posted: Wed Feb 05, 2020 9:38am

Post Subject: BMC 1.5 cylinder head

As far as I have ever known there is only one 1.5D head design. The 1.8D is different, easy way to tell them apaert is that the water tapping on the rear of the 1.8D is tapped 1/2" BSP, the 1.5D isn't, its a different thread.

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