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Joined: Feb 2022
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Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Feb 2022
Posts: 87 Likes: 2 |
I’m going to replace the 25+ year old plugs in my 33, as it’s running very rich. Currently there are AC Delco 43’s in place, I plan to jump up to 44’s. My local Auto Parts store has AC 44’s, but all options have various letters following the 44 (44T, 44TS, etc.). Are these ok to use? Any I should avoid?
They’re going on my 33 1.5 ton truck, 207. Plan to gap them at 28-30
Thanks, Adam
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
Joined: Jan 2002
Posts: 30,701 Likes: 141 |
The AC 43 is a very cold heat range spark plug. It was recomended for heavy truck high speed use, The only general heat range today is the AC45. I have used them in all my cars including my 1934 with good results, The 44T is not for your engine and does not replace the 44.
Gene Schneider
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Joined: Feb 2022
Posts: 87 Likes: 2
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Feb 2022
Posts: 87 Likes: 2 |
Thanks - I’ll jump to 45, then. 43’s we’re placed in 25+ years ago by my father, he did not know what needed to be placed in.
What I’m hearing is I need AC 45’s - with NO lettering following the number. Looks like my local parts store have ACR45’s - will those work?
Last edited by ABowlin; 05/25/23 09:52 AM.
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
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I would not use the 45S which has the extended tip...........actually it should be the AC R45 - R is for a resistor type which all are today,
Gene Schneider
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1 member likes this:
ABowlin |
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Joined: Dec 2019
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ChatMaster - 1,000
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ChatMaster - 1,000
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And "T" stands for a tapered seat (used without a gasket/washer) and of course can not be used in any engine with flat seating surfaces.
Ole S Olson
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Joined: Feb 2022
Posts: 87 Likes: 2
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Feb 2022
Posts: 87 Likes: 2 |
Thank you all. I appreciate the info - still always learning on this, and you all have been invaluable.
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Joined: Feb 2022
Posts: 87 Likes: 2
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Feb 2022
Posts: 87 Likes: 2 |
I switched out the old AC 43’s with new AC 45’s. It sounds the best it ever has. But, now I’m facing a problem of overheating. I replaced my fan belt that same day - to a 1/2 inch smaller diameter, as the older one was stretched and slipping. My question is - would the AC 45’s result in a hotter engine, or would it more than likely be my fan belt causing the issue? Before I did these, I could drive all day in 90 degrees and the temp would stay below 120. Now in 80 degrees, 4 miles and it overheated.
Thanks.
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Joined: Jan 2002
Posts: 30,701 Likes: 141
ChatMaster - 25,000
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ChatMaster - 25,000
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The spark plugs would have no affect on engine temperature.
Gene Schneider
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Joined: Feb 2022
Posts: 87 Likes: 2
Shade Tree Mechanic
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Shade Tree Mechanic
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I thought not, but wanted to verify. Thanks.
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Joined: Sep 2007
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Oil Can Mechanic
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Oil Can Mechanic
Joined: Sep 2007
Posts: 654 Likes: 3 |
Check the operation of the thermostat. While it is open flush the cooling system.
J Franklin
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Joined: Dec 2007
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ChatMaster - 4,000
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ChatMaster - 4,000
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Sorry for the confusion. I think you meant that the new fan belt is 1/2” shorter in length.
I am trying to think why a new fan belt would cause overheating. Did you use the correct cross section belt?
Rusty
VCCA #44680
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Joined: Feb 2022
Posts: 87 Likes: 2
Shade Tree Mechanic
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OP
Shade Tree Mechanic
Joined: Feb 2022
Posts: 87 Likes: 2 |
Yes- I did mean it’s a 1/2 inch shorter. I believe it’s not the right belt, and is sitting too deep within the pulleys, and not spinning the pump / fan fast enough at idle. I found a resource who has the same truck and confirmed I am using a different belt width, as mine is only 1/2” wide, while he is running 11/16” wide. I am going to remedy that and see where it gets me.
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Joined: Dec 2007
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ChatMaster - 4,000
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ChatMaster - 4,000
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If the belt is not the correct cross section (width & angle) it will not drive properly.
Last edited by Rusty 37 Master; 06/03/23 10:42 AM.
Rusty
VCCA #44680
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