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MG TD TF 1500 - Cockpit heater -success!

Hello again,

Here is an update on my heater isssues after my first test ride in my TF for this season, tonight in 3 degrees Celcius, i.e close to freezing temps.

I have now installed a Mojave heater, coolant is coming from the outlet on the LH side under the thermostat, return pipe feeds into lower rad Y pipe. A restrictor disc with a 4 mm hole has been placed in the bypass hose from the Y pipe. Thermostat replaced with an 88 degrees / new from Moss.

Results: After about five minutes warm air was flowing from the heater, after ten minutes the air flow was quite hot. Drivng top down but passenger side of full tonneau attached up front the whole lower cockpit was nice and warm, and my right leg (LHD car)was close to becoming too hot.

I declare this a great success, and a giant leap for mankind! My period Bosch heater is for sale.

Freshly rebuilt rear supension, with poyurethane bushes, Nylatron interleaf pads and KONI telescopic damper kit from Moss gives a firm but comfortable ride, and complete silence from the rear end. As usual the engine is at its best in the crisp cold air tonight, and the Halogen H4 lamps up front showed me the way. Lovely!

regards,

Jan
Jan Emil Kristoffersen

To repsond to a question asked by Alex Waugh in an earlier thread on Mojave heaters :

The three things I have done are to change to a hotter thermostat, introduce a restrictor in the bypass hose, and replace the old Bosch heater with a new Mojave unit. I doubt that thermostat and restrictor are fully responsible for all the increased performance of the heater, BUT, in retrospect I do regret that I did not do the cheap fixes and tested their effect before I bought the Mojave, as they might be a big part of my new found warmth.

regrds,

Jan
Jan Emil Kristoffersen

Jan, in order to better control the cockpit heat, I installed a cable controlled valve in the hot coolant line just behind the heater. I also installed a rheostat type heater motor switch to control the fan speed. My pictures are not that great but are presented here for you. The now unused manual valve behind the heater remains full open and there are no restrictions in the return line.

Jim Merz

Hello Jim,

Thank you for your advice. I see the point with a remote operated valve for the coolant supply to the heater. I have an Y pipe which probably came off a Wolseley 4/44, with an integral valve, much like a water tap. The Mojave heater comes with a three-speed switch, so a rheostat would really be overkill on top of that. But I will look into the wire operated valve idea.

regards,

Jan
Jan Emil Kristoffersen

Jan, I assume your Y pipe valve has to be manually controlled up near the radiator. I prefer to make all my heater adjustments as I drive down the road which I now am able to do.
Jim Merz

Great news! I look forward to when I can install my heater. Till then, lots of pitted wear!

Alex
Alex Waugh

Hey all, can anyone upload an image of the heater plumbing under the bonnet? Thanks, Tom
Thomas McNamara

Tom, here's a case where you probably want to do a search of the archives. This is a rather common topic and has shown quite few variations in the plumbing. There's one from Mort that shows a complete layout of all of the parts. Jim Merz has shown a neat setup. Too many to name. Bud
Bud Krueger

Thomas,

Below is a pic of my heater plumbing. I decided that I didn't want hoses and pipes running through my engine compartment, so I plumbed this set-up.

Take note that the supply connection is a bare ½" copper pipe running under the exhaust manifold. Its connected to couplings at each end and wrapped with lamp wick asbestos, and wired in place - see arrows 3 & 4.

The return is to a fitting welded to the cyl. head plate. See arrow 5. Clean and neat.

Arrow 1 is the welded-over hole on the water pump body (I wouldn't do it so crudley today!). Arrow 2 is the added connection on the elbow.

Its been in my TF since 1957 when I first installed it. Runs great - no problems.

Gord Clark
Rockburn, Qué.

Gordon A Clark

This thread was discussed between 18/03/2014 and 01/04/2014

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