Oil leak type4 engine

Yep, it's not the case cracking thing, just a cover. In you case it looks like the heater is contained with 3 air breather holes, there's no oil in there. So it's fair to assume the the leaking is as you figured - through the bolt holes. If it were me I'd get shot and replace with a plain cover*. You can also get covers that take an oil temp sender which could be handy.
* I wouldn't bother if it didn't need removing to seal anyway.

 

I'll try those doughty washers first

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I bought the temp sender cover off eBay, it's worthwhile, there's also a new seal available from the usual places. The sender isn't expensive and the plate has a blanking plug installed anyway. I think the chap who sells them is boatyardbusses, or similar id.

 

I haven't seen them for the type4 cover with just the two bolt holes mate.

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Got some they stopped the bolt holes leak but I've still got a weep from the plate itself so just ordered an o ring.

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If you're going that far (draining the oil) why not get a proper plate and get rid of that junk you'll never need dangling off the engine? If you want oil temp gauge the plates with the fitting look good to me, It's quite difficult to find a good location for a temp sender - I have mine in a sandwich plate I added for the cooler but if I didn't have that option I'd have done that. Maybe you already have that covered I don't remember.

 

I would if I could find one
I can only find this type

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Seen it mate cheers.
I meant one with the central hole for a temperature sender.

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Wild goose chase, sorry about that... unless you want to fork out £100+. lol

 

I looked on eBay, Ian, that seller doesn't have any for sale

 

My VDO sender screws directly into the oil drain plug hole. Is there a down side to this?

 

Can't think of one, it's an option, some type-1 folk do this. Given the option I'd rather have it somewhere else and leave the drain plug purely for draining oil.

 

^this. Personally, I wouldn't put it in the drain plug hole.

 

Cheers mate

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I've got a blank sump plate

 

I'm going to see if I can get this heater plate to seal first Mick as it's original from the factory. (Swedish dorka)
It fits in with the black overriders and headlamp washers.

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No worries. If not £5 posted

 

The one thing you do know is that it was able to be sealed up somehow originally - to last at least the time between purchase of the heater and the warranty on the heater running out.

There was a sump heater on sale at Volksworld in the swapmeet.. I didnt ask the price.