OHC 500 or 600 engine house

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LajosGere
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OHC 500 or 600 engine house

Postby LajosGere » Fri Jan 05, 2018 3:21 pm

Dear All,

From outside how can i determine this is a OHC 500 engine was or OHC 600 eingine was...
Engine house number is not original I think... : 11862

Thank you
BR
Lajos Gere
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klaus gerhard
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Re: OHC 500 or 600 engine house

Postby klaus gerhard » Fri Jan 05, 2018 8:10 pm

This is the early 1931 design as the cylinderhead is tightened down by short bolts with the nuts in between the barrel fins. (similar to the 4G Mk1). In 1932 the head bolts were tightened down from the top. To see if its 500 or 600 best is to check the bore.
Hope that helps
Klaus

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Re: OHC 500 or 600 engine house

Postby Ian.Taylor » Sat Jan 06, 2018 12:02 am

the 31 distributor was held by a clip if I remember correctly. 32 had 2 bolts to hold it in place. 9 & 3 .This looks like a 31 head

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paul.jameson
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Re: OHC 500 or 600 engine house

Postby paul.jameson » Sat Jan 06, 2018 8:45 pm

11862 is not the original engine number. This should start with either R or T followed by 3 or 4 numbers. I did wonder whether it could have been T 1852 but the T series engine numbers didn't go as high as 1862.

I always thought that the cylinder heads with studs going downwards and nuts between the fins were on 500cc engines whereas the ones held on with bolts from above were 600cc engines. So I am interested in your comment Klaus on the need to check the bore size to be sure.
Paul Jameson
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Former Machine Registrar & Archivist, General Secretary and Single Spares Organiser (over a 25 year period).
Now Archivist once more - but not Machine Registrar.

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markus.nikot
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Re: OHC 500 or 600 engine house

Postby markus.nikot » Sun Jan 07, 2018 10:09 am

Should be an early 500 head (and barrel). 600 has got bolts at the corners of the rockerbox which i can't see here.

TAB 32 4F620-2.jpg



Ian.Taylor wrote:the 31 distributor was held by a clip if I remember correctly. 32 had 2 bolts to hold it in place. 9 & 3 .This looks like a 31 head


32 has clips too as you can see at the pic.

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