 fan belt problems |
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| jat914 |
 Dec 15 2019, 02:20 PM
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#1
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Newbie  Group: Members Posts: 25 Joined: 3-December 13 From: Arizona Member No.: 16,718 Region Association: None  |
I had to replace the fan belt on my race built 2065 motor. The replacement belt is made in China and at high rpms it kept flying off! Has anyone had this problem and is there a solution?
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| rgalla9146 |
Dec 15 2019, 07:13 PM
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#2
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Advanced Member Group: Members Posts: 4,671 Joined: 23-November 05 From: Paramus NJ Member No.: 5,176 Region Association: None 
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It is less likely a counry of origin issue and more likely a hardware problem.
There is a recent thread here concerning belt / alignment / brackets |
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| porschetub |
Dec 17 2019, 02:19 PM
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#3
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Advanced Member Group: Members Posts: 4,754 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(rgalla9146 @ Dec 16 2019, 02:13 PM)  It is less likely a counry of origin issue and more likely a hardware problem. There is a recent thread here concerning belt / alignment / brackets I only use Contitech belts because they are very durable and fit well same as I only use OEM oil filters but that's just me. Make sure your altenator pulley isn't worn and polished up (slippage) ,make sure you check the mounting brackets (as mentioned) ,try to do a basic alignment before tensioning the belt. |
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| brant |
Dec 17 2019, 03:03 PM
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#4
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914 Wizard Group: Members Posts: 11,824 Joined: 30-December 02 From: Colorado Member No.: 47 Region Association: Rocky Mountains 
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Gates makes a belt with ribs on the exterior
It’s is superior to most other belts There is a trick for high rpm belt slip and racing... but not good for the street and charging. So a better belt is the 1st step Then check the pulleys or replace would be next |
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| sixnotfour |
Dec 17 2019, 03:38 PM
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#5
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914 Wizard Group: Members Posts: 10,680 Joined: 12-September 04 From: Life Elevated..planet UT. Member No.: 2,744 Region Association: Rocky Mountains
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the new continental/ ContiTech are made in .......white letters since 2014
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| 914Sixer |
Dec 17 2019, 04:06 PM
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#6
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914 Guru Group: Members Posts: 9,034 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Make sure you are using the correct size belt. 9.5 x 965 mm or 021.903.137A
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| jcd914 |
Dec 17 2019, 04:27 PM
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#7
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Advanced Member Group: Members Posts: 2,081 Joined: 7-February 08 From: Sacramento, CA Member No.: 8,684 Region Association: Northern California |
This was a fairly common issue for track use or auto-x drivers since quick RPM changes were common. Even with all the brackets and pulleys in good shape and properly aligned the high RPM could throw the belt just from normal stretch.
On track cars or Auto-x only cars we used to run a narrower belt that fit deeper in the pulley and was less likely to come off at high RPM. It was a domestic sized belt that I think was 7/16 wide or about 8mm but I am not sure. These did not have lifespan a belt should have for a street car but they stayed on track/auto-x cars. I still have an old one but I don't think it has numbers on it anymore. Jim |
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| porschetub |
Dec 17 2019, 08:18 PM
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#8
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Advanced Member Group: Members Posts: 4,754 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(914Sixer @ Dec 18 2019, 11:06 AM) Make sure you are using the correct size belt. 9.5 x 965 mm or 021.903.137A 9.5 mm are you sure ? I thought it was 10 x 965 ?,2 of my engines have that size belt...not saying you are wrong but TBH have never checked. |
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| 914Sixer |
Dec 18 2019, 06:59 AM
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#9
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914 Guru Group: Members Posts: 9,034 Joined: 17-January 05 From: San Angelo Texas Member No.: 3,457 Region Association: Southwest Region
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Belt
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| iankarr |
Dec 18 2019, 10:18 PM
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#10
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The wrencher formerly known as Cuddy_K Group: Members Posts: 2,526 Joined: 22-May 15 From: Heber City, UT Member No.: 18,749 Region Association: Intermountain Region
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QUOTE(rgalla9146 @ Dec 15 2019, 08:13 PM) It is less likely a counry of origin issue and more likely a hardware problem. There is a recent thread here concerning belt / alignment / brackets (IMG:style_emoticons/default/agree.gif) I had a repetitive belt slipping issue. Turned out the alternator pulley was cracked. |
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| rhodyguy |
Dec 19 2019, 11:12 AM
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#11
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Chimp Sanctuary NW. Check it out. Group: Members Posts: 22,193 Joined: 2-March 03 From: Orion's Bell. The BELL! Member No.: 378 Region Association: Galt's Gulch |
The mount bracket for the alt. My car made a chirping sound when running and I could never get the belt to remain tight.
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| jat914 |
Dec 19 2019, 02:50 PM
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#12
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Newbie Group: Members Posts: 25 Joined: 3-December 13 From: Arizona Member No.: 16,718 Region Association: None |
QUOTE(jcd914 @ Dec 17 2019, 03:27 PM) This was a fairly common issue for track use or auto-x drivers since quick RPM changes were common. Even with all the brackets and pulleys in good shape and properly aligned the high RPM could throw the belt just from normal stretch. On track cars or Auto-x only cars we used to run a narrower belt that fit deeper in the pulley and was less likely to come off at high RPM. It was a domestic sized belt that I think was 7/16 wide or about 8mm but I am not sure. These did not have lifespan a belt should have for a street car but they stayed on track/auto-x cars. I still have an old one but I don't think it has numbers on it anymore. Jim I will try a thiner belt (8mm) since the alignment was fine before I started having this problem. Thanks for all of the input. |
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| porschetub |
Dec 20 2019, 02:22 PM
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#13
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Advanced Member Group: Members Posts: 4,754 Joined: 25-July 15 From: New Zealand Member No.: 18,995 Region Association: None |
QUOTE(jat914 @ Dec 20 2019, 09:50 AM) QUOTE(jcd914 @ Dec 17 2019, 03:27 PM) This was a fairly common issue for track use or auto-x drivers since quick RPM changes were common. Even with all the brackets and pulleys in good shape and properly aligned the high RPM could throw the belt just from normal stretch. On track cars or Auto-x only cars we used to run a narrower belt that fit deeper in the pulley and was less likely to come off at high RPM. It was a domestic sized belt that I think was 7/16 wide or about 8mm but I am not sure. These did not have lifespan a belt should have for a street car but they stayed on track/auto-x cars. I still have an old one but I don't think it has numbers on it anymore. Jim I will try a thiner belt (8mm) since the alignment was fine before I started having this problem. Thanks for all of the input. After Marks comment about belt size I checked my supply and also found an 8 X 965mm,tryed it on my spare T4 motor (next build) and as Jim mentioned it fitted better in the grooves ,and was level with the top of both pulleys,even being a bit worn the adjustment was about centre on my altenator top bracket Considering any part of the belt not fully contacting the pulley vee's is lost drive ,perhaps the narrower belt is the way to go. |
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