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Issue with motor running hot

Posted by ss75b

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Issue with motor running hot #1
ss75b Scott Schipper ROCHERSTER, Rochester . NY 75 3.5 rover v8, USA 1975 MG MGB	Posted: June 13, 2012 08:51PM Registered: 7 years ago Posts: 115

I've been working to get my car on the road. It runs great, but I have been having problems with high temps (cooling sys)
After some great advice ( Glen Towery and Leon Zak) I ordered a new thermostat (160 deg) . I drained the coolant and found this in my new raditor.
Looks like I have some flushing to do

Scott
Rochester, NY
75B citron

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Re: Issue with motor running hot #2
mstemp Mike Stemp Calgary, Alberta, Canada 1980 MG MGB V8 Conversion	Posted: June 13, 2012 08:56PM Registered: 6 years ago Posts: 217

How about a head gasket?

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Re: Issue with motor running hot #3
ss75b Scott Schipper ROCHERSTER, Rochester . NY 75 3.5 rover v8, USA 1975 MG MGB	Posted: June 13, 2012 09:09PM Registered: 7 years ago Posts: 115

I think all this crud was hiding in the motor. Its been siting for a long time.

Scott
Rochester, NY
75B citron

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Re: Issue with motor running hot #4
ss75b Scott Schipper ROCHERSTER, Rochester . NY 75 3.5 rover v8, USA 1975 MG MGB	Posted: June 13, 2012 09:14PM Registered: 7 years ago Posts: 115

I drove it for about 18 miles and everything was OK. Then I think with the hot coolant run thru the motor , the crud loosened up and the temp started rising

Scott
Rochester, NY
75B citron

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Re: Issue with motor running hot #5
cgill Chris Gill Salmon Arm, British Columbia, Canada 1971 MG MGB GT 1979 MG MGB "BOPR V8 Conversion"	Posted: June 14, 2012 11:09AM Registered: 6 years ago Posts: 2,832

What are you getting when you say "high temps"? Are you basing the readings on your temperature gauge or using an infrared thermometer?

From all I have read these engines like to run around 190-200F. I have a 180F thermostat in mine and it works well.

My other obsession...photography!

http://www.flickr.com/photos/77646803@N00/

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Re: Issue with motor running hot #6
blkcloud Mitchell Hackett Huntington New York, USA 1967 MG MGB 2004 Porsche Boxster	Posted: June 14, 2012 11:24AM Registered: 4 years ago Posts: 769

There's another thread if you scroll down about hot temps in South Florida that has a lot of good info on fams and cooling. Regards, Mitch.

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Re: Issue with motor running hot #7
mstemp Mike Stemp Calgary, Alberta, Canada 1980 MG MGB V8 Conversion	Posted: June 14, 2012 04:07PM Registered: 6 years ago Posts: 217

Scott,

Back to my commment about the head gasket. All that crud looks like oil/water emulsion, or is it just fooling me in the photo? If it is oil then where did it come from. I would be concerned for my motor if I saw that in my new rad thats for sure.

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Re: Issue with motor running hot #8
ss75b Scott Schipper ROCHERSTER, Rochester . NY 75 3.5 rover v8, USA 1975 MG MGB	Posted: June 14, 2012 08:56PM Registered: 7 years ago Posts: 115

No oil in there, I,m pretty sure it just previous junk that just let loose. The temp was in the normal range on the gauge for 18 miles, then it started climbing to the high mark.

Scott
Rochester, NY
75B citron

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Re: Issue with motor running hot #9
cgill Chris Gill Salmon Arm, British Columbia, Canada 1971 MG MGB GT 1979 MG MGB "BOPR V8 Conversion"	Posted: June 15, 2012 01:15PM Registered: 6 years ago Posts: 2,832

Do you know what your temp gauge is actually reading in Fahrenheit? N on my smiths gauge is 160F. Just below the solid line near the H is about 190 where these engines like to run. Mine never goes above that.

My other obsession...photography!

http://www.flickr.com/photos/77646803@N00/

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Re: Issue with motor running hot #10
ss75b Scott Schipper ROCHERSTER, Rochester . NY 75 3.5 rover v8, USA 1975 MG MGB	Posted: June 15, 2012 07:48PM Registered: 7 years ago Posts: 115

i'll check it after I flush

Scott
Rochester, NY
75B citron

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Re: Issue with motor running hot #11
superdave david morris north carolina, USA	Posted: June 16, 2012 09:42AM Registered: 2 years ago Posts: 519

The previous owner on my V6 MGB got frustrated with the whole project over the car running hot. Nothing he did seemed to help. When I bought it, I started checking things and the gauge wasn't indicating properly. It ran right up to the "hot" indicator. I stuck my wife's food thermometer between the fins of the radiator and it indicated 175 degrees (not scientific, but close enough for government work). I replaced the electric Smiths gauge with a mechanical Autometer gauge and it now runs "cooler".

Make sure you are barking up the right tree.

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Re: Issue with motor running hot #12
TRIKER john fenner BFE, Miami Fl / ( Cuba), USA 1972 MG MGB "Red Barchetta"	Posted: June 17, 2012 11:05AM Registered: 3 years ago Posts: 1,529

If you are still getting debris after you flush it out you can build a zoo gun, take a piece of tubing the size of the rad hose, braze a washer on the end with a female garden hose end on it, then a fitting in the side for an air hose to attatch with a ball valve. Pull the thermostat out and hook this up to the upper radiator hose to blast through the engine backwards, turn the water on and once the system is full of water hit the air to it then repeat till it comes out clear. Dont use this on plastic tanked radiators as I have blown a tank off before LOL.

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Re: Issue with motor running hot #13
ss75b Scott Schipper ROCHERSTER, Rochester . NY 75 3.5 rover v8, USA 1975 MG MGB	Posted: June 17, 2012 09:04PM Registered: 7 years ago Posts: 115

I flushed the radiator and the block. I think I removed all the gunk. I ran it up to temp, the fan turned on and then off.
Going for a ride shortly hopefully it all set.

Scott
Rochester, NY
75B citron

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Re: Issue with motor running hot #14
ss75b Scott Schipper ROCHERSTER, Rochester . NY 75 3.5 rover v8, USA 1975 MG MGB	Posted: June 19, 2012 12:26PM Registered: 7 years ago Posts: 115

I went for drive today (about 40 miles 90 deg outside). the stock gauge went up to just before the H and didnt go any higher.
I will consider this normal and go with it

Scott
Rochester, NY
75B citron

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Re: Issue with motor running hot #15
mrkenmgb Ken DeLEEUW Ormond Beach , fl, USA 1970 MG MGB GT "Old Ormond White" 1976 MG MGB V6 Conversion "Boynton Blue"	Posted: June 20, 2012 10:37AM Registered: 7 years ago Posts: 1,120

Scott get rid of the stock gauge. For your year dash, Auto meter has gauges that fit and look like original. They also read in degrees,not C-N-H. I think it is important to know how hot is hot.
Ken

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Re: Issue with motor running hot #16
cgill Chris Gill Salmon Arm, British Columbia, Canada 1971 MG MGB GT 1979 MG MGB "BOPR V8 Conversion"	Posted: June 20, 2012 10:38AM Registered: 6 years ago Posts: 2,832

Interesting Scott. That's where mine sits in warm weather as well. As long as the fan is coming on it sounds like things are okay. I think I will eventually get a gauge with actual temperature increments on it to put my mind at ease!

My other obsession...photography!

http://www.flickr.com/photos/77646803@N00/

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Re: Issue with motor running hot #17
ss75b Scott Schipper ROCHERSTER, Rochester . NY 75 3.5 rover v8, USA 1975 MG MGB	Posted: June 20, 2012 09:36PM Registered: 7 years ago Posts: 115

I agree, I would much rather know the actual temp. Is the auto meter elect or mechanical?

Scott
Rochester, NY
75B citron

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Re: Issue with motor running hot #18
mrkenmgb Ken DeLEEUW Ormond Beach , fl, USA 1970 MG MGB GT "Old Ormond White" 1976 MG MGB V6 Conversion "Boynton Blue"	Posted: June 22, 2012 10:24AM Registered: 7 years ago Posts: 1,120

I think you can get either one from Auto meter.

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Re: Issue with motor running hot #19
superdave david morris north carolina, USA	Posted: June 25, 2012 03:58PM Registered: 2 years ago Posts: 519

I'm always a fan of mechanical gauges. The full 270 degree needle sweep is a lot more informative than the 90 degree sweep you get on an electrical gauge.

Edited 1 time(s). Last edit at 06/25/2012 04:00PM by superdave.

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Re: Issue with motor running hot #20
rficalora Rob rficalora Cypress, TX, USA 1976 MG MGB V8 Conversion "MG MUTT"	Posted: June 25, 2012 08:09PM Registered: 7 years ago Posts: 1,679

Electric gauges come in 270 sweep versions too.

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