It depends on the climate in your country and the anticipated lowest temperatures.

It’s really worth getting an antifreeze hydrometer, then you can use it for all your vehicles. Try searching the web for antifreeze tester or antifreeze hydrometer – the tools are only a few pounds. The ones which contain 3 or 4 floating balls work perfectly well and will indicate the ehtylene glycol concentration.

Most people would use a 40-50% mix. But if you are in places of extreme winter temperatures such as Canada then you would need a stronger mix.

A more accurate tool for determining antifreeze concentration in the coolant is a refractometer, but these are more expensive. A hydrometer is a sufficiently useful tool for most situations.

It is possible to use propylene glycol, but it is more expensive and not very common. Just be aware that the product exists when you are measuring concentration levels.

Steve.

The details of how to put the plugs into the head are not on the DVD. We didn’t do this for that engine (on the DVD) and it starts really well, but I understand that some people prefer to put the heater plugs in to aid starting if the engine is partially worn or starting performance isn’t brilliant. What I would say is to take a look at the condition of the timing chain and the backlash in the injection pump drive gears, as these can both improve the situation.

For anyone in Northern Ireland then these people are set up with a jig to do the job…

http://vintagetractorengineer.com/2010/02/engine-reconditioning-comiskey-engineering-works/

Steve.