7 replies to this topic

[SirBallD]

Hi Mini-mates,

 

I'm doing a complete restoration of my classic mini 1979.

As a part of this restoration, I'm replacing the engine from a poorly built 998cc A-series (long story) to a 998cc A+ series engine, with a lead free CAM4810 head. I'm currently doing a complete refurbish of this engine.

 

The issue is that the cylinder head has no hole for the heater valve at cylinder 4. So now I have to redo the heating hoses. I need to replace all the hoses anyway as the hoses are old and brittle.

Does anyone have a diagram of the hoses needed and where they go from and to, for a configuration similar to mine. 

 

I have a heater inside the cabin with inlet and outlet.

No hole for heater valve in cylinder head at cylinder 4.

Water pump without bypass hose and I have a thermostat sandwich plate.

I have bought an inline heater valve for this, but I'm still unsure where this will go.

 

If someone can make a drawing to explain this to me I would appreciate it greatly. Pictures of similar configurations would also help 

 

Thank you very much in advance.

Best regards

Stefan 

[nicklouse]

Drill it out and run the hoses as original. 15 or 16mm drill will do.

[cal844]

The bore dimple on an undrilled head is 1/2inch drill size. I just matched the size that was on the head.

The two fixing stud holes should already be threaded ready for the valve

[SirBallD]

It seems like there is only the center hole which is not drilled all the way through. The two fixing stud holes are not present   not even an indication of where they should be.

I guess I have to give it a shot and drill the holes, trying not to fudge everything up 

Edited by SirBallD, 01 December 2020 - 06:12 PM.

[cal844]

It seems like there is only the center hole which is not drilled all the way through. The two fixing stud holes are not present not even an indication of where they should be.
I guess I have to give it a shot and drill the holes, trying not to fudge everything up

The holes should be there for the small studs to screw into, perhaps they have been painted over or filled with crud?

[SirBallD]

 

It seems like there is only the center hole which is not drilled all the way through. The two fixing stud holes are not present not even an indication of where they should be.
I guess I have to give it a shot and drill the holes, trying not to fudge everything up

The holes should be there for the small studs to screw into, perhaps they have been painted over or filled with crud?

 

Cal844, I agree with you as I've never seen a cylinder head without all three holes. This must be the first, unless if the previous owner have welded it up and then skimmed it   .

 cylinder head CAM4810 no water2.jpg   59.66K   1 downloads

 

 

I have another CAM4810 cylinder head with all the holes and outlet for bypass hose.

Unfortunately it has a damage between the valves. I'm unsure if I should have it welded or if I should grind it and make it similar on all four cylinders. It's a very small area and I assume that it doesn't make any difference to the overall performance of the engine.

 Cylinder head small damage1.jpg   31.45K   1 downloads

 

 

Should I go for the slightly damaged cylinder head, with all the holes and forget about the "no hole cylinder head"   ?

[nicklouse]

That is odd.

 

ok let’s say you want to use that head as is.

 

you will need a sandwich plate with a take off to go under the thermostat housing. That take of is the heater feed. 
 

thermostat goes between sandwich and housing.

[Ethel]

You could blend that broken nose out to good effect, but it'd be more work 'n cost than just sorting the heater take off.

 

If you can lay your hands on a pillar drill it wouldn't be hard to drill & tap stud holes using a heater valve as a template, or you could acquire a sandwich plate from DSN or one of the other usual culprits. Be aware there'll be a mismatch in hose bores, but nothing you can't sort. Your Min will have been 1/2", later ones used 5/8".