M42 radiator swap complete!

[Sagaris]

I simply cut the "T" hose that connects to the original M20 late model reservoir down a few inches so that it has a straight shot towards the reservoir outlet on the M42 radiator.Then I used a 1" (memory may be failing me on that size) ID straight piece of hose (~6-9" length) off the M42 reservoir outlet which connects to the cut "T" hose. You need a 1" to 3/4" reducer (or whatever the sizes are) to connect the two hoses. This is because the OE hoses flare up to a larger diameter at the connection point and generic heater hose is a constant diameter all the way through.

[bmw325ijohn]

What did you do about the hose that Whent to the resivior under neither the intake? Did u replace with straight hose

[einstein57]

A lower m20 hose is about 4 inches long and connects to a metal pipe

Early model lower hose. You just need to shorten it. I'll do a nice write up when I install one in the another early model chasis pretty soon.

[Gruelius]

easy as to bleed... just use your mouth :P

then again ive probably got a pocket of air in there somewhere..

[Gruelius]

nvm, saw it was specified in the 2nd page, $70 from bmw aust lol

[Gruelius]

so what hose do we use? my early style lower rad hose wont even fit over the barb on the radiator lol

[Stephen]

bout to press order on a slew of parts from blunt tech to do this on my eta. im switching to the late model water pump and will probably just modifty the m20 hose like White325is did for the upper one. Any other things need replacing on an early car?

[Gruelius]

do the m42 radiators fit early model cars?

i was going to fit a e36 one from a mates totalled car but the series 1 bodies dont have that hook on the radiator support..

[NC325iC]

What is everyone doing to keep the ps pump off the drain plug? Mine might fit a sheet of paper btw them, I have another ps pump with a smaller pulley center on it but I donno if it works.

anyone?

I wonder if you could relocate the drain and cut off the old one. I originally would have just shortened it but the plug on this thing is strange

[NC325iC]

A lower m20 hose is about 4 inches long and connects to a metal pipe

[NC325iC]

What is everyone doing to keep the ps pump off the drain plug? Mine might fit a sheet of paper btw them, I have another ps pump with a smaller pulley center on it but I donno if it works.

[browntown]

I'm still holding out hope that a m30 mounted far enough back without the mechanical fan will allow a m42 rad or some other integrated overflow tank radiator./

[einstein57]

yup

[NC325iC]

I just used a lower m20 hose. just cut to fit. Works great and cheaper then a touring hose. If their is a large enough demand i can make an m20 specific upper radiator hose made of 3-4 ply silicone. Price would be about $50.

a lower m20 hose?

[einstein57]

OK, so i have most of what i need and i took the radiator out of the eta today (starting the engine swapping) and noticed that it doesnt have any provisions for mounting this newer style radiator. The old style radiator sits on the bottom of the core support on a few tabs. newerstyle have mounts that come out from the frame or core about half way up the radiator. How have you guys with older cars been doing it?

Take the rubber mounts off and cut out a chunk so you can center it. Also make sure you have a good tranny stop cause the pulley will eat in to the drain plug.

i can tell you that the stock eta hose does not fit

edit: Lev any way you can double check that hose? please?

ru

I just used a lower m20 hose. just cut to fit. Works great and cheaper then a touring hose. If their is a large enough demand i can make an m20 specific upper radiator hose made of 3-4 ply silicone. Price would be about $50.