Timing Gear Cover

Unfortunately I will have to replace my timing cover which no big deal, But I have a question.
Purchasing the covers from AN or RGM they are deafferent from my 72 Cover.
Obvious differences are a access port the gauge the timing chain, but on the left of the cover is a raised dome section
1. What is this dome
2. Is the cover drilled for OPRV oil to be dropped back into the timing chest or ported back into the oil pump

Thank you

olympus said:

Unfortunately I will have to replace my timing cover which no big deal, But I have a question.
Purchasing the covers from AN or RGM they are deafferent from my 72 Cover.
Obvious differences are a access port the gauge the timing chain, but on the left of the cover is a raised dome section
1. What is this dome

Click to expand...

That is the Mk3 cover with the timing chain inspection plug and "dome" for the anti-drain valve.

https://www.rgmnorton.co.uk/buy/timing-cover-mk3-can-be-used-on-commandos-1970-on_408.htm

olympus said:

2. Is the cover drilled for OPRV oil to be dropped back into the timing chest or ported back into the oil pump

Click to expand...

Mk3 cover so into the timing chest.

Many thanks L.A.B this will save me have to employ an oil tank mounted anti drain valve

Hi

You will need to use a Mk 111 oil pump seal if you use this cover.

Graham

Thank you I'll remember this

olympus said:

Thank you I'll remember this

Click to expand...

You also need the Mk3 pump spigot/bush, however, both parts are included in the AN/RGM Mk3 timing cover 'kits'.

https://andover-norton.co.uk/en/shop-details/16717/timing-cover-750-850-mk3-c-w-all-fittings