NC30 Engine Block Coolant Leak

[allanmckay]

Hello, this is my first post on this board but I've been lurking since i bought an NC30 late last year.

Not long after I bought it, it sprang a coolant leak in the joint that attaches the coolant pipe to the block (my terminology may be wrong, i'm fairly new to this level of detail, but eager to learn - hence buying an NC30 as a project). I have included a picture to show where the leak is (pic not of my actual engine), in case my description is too bad!



I repaired it initially using a Radweld type of liquid, but I'm looking to do a proper job of it now, so my question is, is it possible to purchase that specific pipe/fittings/gaskets etc, or am I looking at needing a new block?

I have looked everywhere not found anything, but it's made more difficult by not knowing what that part is actually called!

Any help is much appreciated.

Thanks.

[porndoguk]

see here

viewtopic.php?f=22&t=25980
regarding a NC24 but youll get the idea

[allanmckay]

Thanks for the reply, but unfortuntately that is a slightly different issue to mine. That is regarding a problem with the oil pipes, where as my leakis actually coolant, from the soft metal joining the water pipe onto the engine block.

I erm....borrowed....that pic from the NC24 thread, and have updated it with a green mark to show the exact location of my leak, in case that makes it any more clear than my previous pic.



Thanks for the reply though.

[allanmckay]

Ah, nevermind, there is a very similar thread to the one you posted, with different info in it.

It does suggest that the bit i'm after isn't available to buy separately though

So I guess I either find someone who can weld it up, or I look at rebuilding the whole engine, with a new block.....ah well, I was after a learning experience!

[skinnydog0_0]

So is the actual top engine casing cracked, or is it just the joint between the coolent pipe and the block?

[allanmckay]

It's just the joint (union?) between the pipe and the block. I think that once I have got the carbs off (proving to be a right pain due to rusted, destroyed clamp screws!), I should be able to get the pipe and unions off, and see if i can get it welded.

[skinnydog0_0]

if it's just the union, between the pipe and the case you can seal that with hylomar instant gasket. i have used it a few times and never had a problem. just take the pipe off clean the mating surfaces and apply a little hylomar leave it for a couple of mins then fix back together. hey presto job done

[Cammo]

You should be able to find a spare water pipe cap from a blown engine without too many worries, better than a repair job IMO. Just stick a wanted ad looking for a blown motor in the classifieds.

If it's part numbers 5 & 13 in the diagram below then they are still available:
http://www.akhara.com/nc30/nc30parts/files/16.htm

David silver has new ones but pricey at 40 quid plus:
http://www.davidsilverspares.co.uk/part ... 509MR8000/

They also have the gasket available for £2.40:
http://www.davidsilverspares.co.uk/part ... 301MB0000/

[Neosophist]

As cammo has said.

Those caps bolt on each side of the pipe, theres an o-ring on each end of the pipe and a gasket at the base of the cap.

Best to get one from a broken engine rather than bodge it :)

[allanmckay]

Thanks very much guys. that's exactly the information I was looking for....but was clearly too incompetent to find!

I definitely want to replace it with a new bit, rather than bodge, the radweld that's in there is working fine at the moment, but now that I'm stripping it all down, I'd rather replace it with a proper fix.

I will get a gasket ordered from David Silver, and try and get my hands on a second hand water pipe cap (it is indeed part 13 in that diagram).

Thanks again, I knew signing up here would be worth while!