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#41
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For me, with exact same clutch, it was the belt. Just a little tighter on the belt and my squeal was gone. The clutch works well and should be silent. However, you will hear the fan roar when it is fully engaged.
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#42
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Definitely the belt. Also you will find that a Gates or NAPA equivalent belt will be much quieter that the cheaper belts that stretch like a rubber band.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon. |
#43
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Fullback, I had the same problem with my 66 4speed GTO. Car now has a built 400 instead of the 389. But I still have the 389 block for it. I was never a fan of an aluminum radiator but decided to give it a try. I bought a Cold Case thru Ames at the last PY show... probably 4 years ago. Best thing I did. No overheating now. Tho it will hit 195 once in a while depending how long you have to sit waiting for a redlight to change to green. Some here are a long wait. And that's using a 180 thermostat.
IF I recall correctly, the original factory thermostats back then were 192.
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Gary Get in, ShuT Up, Hang On! Member of the Baltimore Built Brotherhood MY GTO built 4th Week of March 1966 "Crusin' Is Not A Crime" Keep yer stick on the ice. |
#44
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On my freshly rebuilt 461 i am running 190 in traffic and 185 when i get it moving that is 90F weather
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#45
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Thanks guys.
Time to tighten up the belt. It does run cooler. AWESOME! |
#46
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Yesterday was the first real test for the new fan clutch. I am sorry to say that it FAILED.
It was a really hot day yesterday. The car still ran at 205 and 210 degrees. Same as before. Could the clutch be bad? I do not hear it like some people describe. I am disappointed in the results. Maybe I need a new thermostat. Any Ideas? P.S. What is the belt size for fan and power steering? Thanks FB66 |
#47
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This:
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#48
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Take the thermostat out while you are working on the problem. My friends and I have probably tested over two dozen Pontiac engines and none of them ran hotter with the thermostat removed. There is enough restrictions in the engine and cooling system that the coolant cannot travel "too fast". In short, no thermostat and a perfectly working thermostat cool the same. There are other good reasons for running a thermostat but for testing you can't beat simply removing it and having one less variable.
You mentioned belt squeal earlier in the thread, and that would be a sign that the fan clutch is working properly. Use a good quality belt adjusted properly and you have removed another possible weak point from the testing process. Use a known good temp gun to verify actual coolant temperature. For example, Stewart Warner guarantees their gauges to be accurate within 10° of reading. That means that an engine running an actual 190° can have the gauge read anywhere between 171° and 209° and it is within spec. Anyway, getting a second opinion might prove the gauge is very pessimistic. Now take a Chinese gauge and it can literally read anywhere. Pontiac used a massive amount of different pulleys over the years, and for that matter even for a given model year. My '67 and my friends '66 used a 1/2" belt for the belt that went around the crank, water pump, and power steering, and a 7/16" belt that went around the crank, water pump, and alternator. In Gates terminology this would be an XL 25 belt that started with a 9 for the 1/2" belt and a 7 for the 7/16" belt. In my car's case, it took a Gates XL 25 9520 for power steering and a Gates XL 25 7490 for alternator. The different belt widths matched the pulleys with the wider groove in front. Not all years had the staggered widths.
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Mick Batson 1967 original owner Tyro Blue/black top 4-speed HO GTO with all the original parts stored safely away -- 1965 2+2 survivor AC auto -- 1965 Catalina Safari Wagon. |
#49
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Thanks for the information. I will give a try. Maybe it is the gauge.
FB66 |
#50
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I have the Hayden SD clutch on my lemans and the HD on my firebird. The SD is much louder than the HD at most speeds, at least to me.
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1966 Lemans convertible 455/5spd 1968 Firebird convertible 400/4spd Need more Pontiacs! |
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