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which are simply reamed in the upper and lower half of the camshaft covers, of which the lower half is forged steel, while the top cover is aluminum.

In service this necessitates replacement of these covers, as adjustment of these bearings is limited by the amount of room between rocking lever and top of cover.

Sometimes valve guides had to be renewed.

The very peculiar valve timing of the Opel-B. M. W., differing from that of the original B. M. W. is worth note.

Whereas the original B. M. W. has approximately: 
Inlet opens 5 deg. E. Exhaust opens 52 deg. E.
Inlet closes 37.5 def. L.Exhaust closes 19.5 deg. L. wit individual differences.

The Opel-B. M. W. shows the following settings:

Inlet opens 14 deg. E. Exhaust opens 55 deg. E.
Inlet closes 63 deg. L. Exhaust closes 25 deg. L. with large individual differences.

This extraordinary valve timing reduces still the already very low fuel consumption so that with these motors a fuel consumption of 180 grammes per metric horsepower, equal to 0.4 


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