1973 overheating

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1973 overheating

Postby yellow73 » Mon Jun 14, 2010 8:55 am

I read the 67 overheating and I have a similar problem. Stock 1600 dual port. When I start driving the oil pressure goes up to between 40 and 50 after I have driven it a while the pressure decreases. by the time I have driven it 20 min. or so the pressure is below 20. When I drove it to the bug meeting tuesday from Moore to Midwest City the temp. had gotten to 240.
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Re: 1973 overheating

Postby vdubjim » Mon Jun 14, 2010 11:18 pm

does it run ok? or run poorly?

those temps your talking about depend alot on what gauges, what senders, where the senders are.......

If your fan belt is good, there is no trash in the fan, all tins on, motor is not wore out, cooling flaps not stuck shut, its good to go.
If it runs fine, run it.
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Re: 1973 overheating

Postby yellow73 » Wed Jun 16, 2010 10:54 am

VDO gauges and senders. Pressure sender replaces the idiot light sender. Temp sender replaces the cap screw for the pressure release plunger. I did reinstall the plunger and spring. Fan belt tight and new, no trash in fan, cooling tower fins clean, motor recently rebuilt approximately 500 miles on it. The tin is installed and new rubber surround. I always have trouble getting that front (flywheel side) tin piece vertical and tucked under the rubber. I have the original oil bath air breather with the preheat tube installed. I probibly should disconnect this during the summer, I usually plug off the heater vents also to allow more air to go to the cylinders. What about oil? Does brand or weight matter in temperature I know it matters in gas milage? OH yea it runs great. I guess I need to run a compression test and check the plugs. I just do not want it to get too hot and burn the valves.
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Re: 1973 overheating

Postby vdubjim » Wed Jun 16, 2010 4:30 pm

who built the motor, and whats the compression set at?
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Re: 1973 overheating

Postby 62DC » Wed Jun 16, 2010 4:55 pm

did anyone check the radiator :lol:
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Re: 1973 overheating

Postby yellow73 » Thu Jun 17, 2010 9:57 am

I built it. Roger at Bethany did the machine work. Reworked the entire bottom end, new heads. Cylinders/jugs were within specs so I replaced the rings. The cylinder top clearance was within specs. I had to shim my 1915 the cylinder clearance was too close so I always check that. It sucks to tear one back down to install shims. I will pull the plugs and check the compression this weekend. Thanks for your input.

Yes I did check the radiator. I cleaned the cooling tower (VW radiator).
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Re: 1973 overheating

Postby gimpy60 » Thu Jun 17, 2010 1:32 pm

these little engines will not run all the same temp. like Jim said if it is running ok, run it. I for one cannot se how the temp sender can be in the pressure relief plug. not supposed to be a flow of oil right there, the hole in the bottom of the bore is for oil that will inevetibly get past the piston. nothing more than a drain hole. the engine I just built has the pickup in the extended sump, I get a reading of the oil temp as it goes into the pump. ran down the road the other eve. with about 90 ambient, oil was about 180 when I got back. about 10 miles, balls out driving. my pressure was about 25 at 50 mph, don't fret about the pressure, volume is what you need to be concerned with. worst thing a vw owner can do is put a pressure guage in their car, blows their mind. high pressure in any engine washes bearings out.............let us know.....JP
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Re: 1973 overheating

Postby 62DC » Fri Jun 18, 2010 12:57 pm

yep JP is driving with his balls out again .. what type of exhust system are you running...
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Re: 1973 overheating

Postby yellow73 » Sat Jun 19, 2010 6:12 pm

gimpy60 what kind of sender do you have in your extended sump? Where did you get it? I installed the enlarged oil pump so as far as volume I should be OK. I pulled the plugs and tested the compression this afternoon. The plugs were brown, 3 and 4 were almost black so I guess it is not running lean. Compression on 1 was 120, 3 was 125, 2 and 4 were 135.
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Re: 1973 overheating

Postby gimpy60 » Sun Jun 20, 2010 6:35 am

It's a vdo sender, about 3/8" on the base. Got it at Bethany, pan had a boss cast in it, drill & tap. I have never ran a temp. before, just curious as to what the temps. run after reading much bs on the issue. I for one don't think your too hot where your running. Do you have all tins & thermostat in place?
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