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Topic: M-11 Alternator Belt Tension (Read 437 times) previous topic - next topic

M-11 Alternator Belt Tension

So, I am installing my Alternator today, and would like to know just what Tensioner Gauge to buy?  Since this engine does not have a Mechanical Tensioner, and is direct drive, it requires proper tension gauge! NAPA evidently says that the Tension Gauges they sell are Manufacturer Specific, and not necessarily just the Engine Manufacturer, and of course F/T is not listed in anybody's books! I realize I can just measure deflection, but this Alternator's way too expensive to wear bearings out, in short order, if too tight, or have a Spare, if too loose, and it flops around, and flies off!  I know I can call NAC, but who knows when they will get back to me?  Thanks!
Tom & Barb Root
'95, 40' U-320C SE, bought from Dave Head, 8/2017  FT Motorcade # 18196 Coach Build# 4663 October '94
2015 VW Golf Sportwagen, 1991 Suzuki Samurai, Off-Road Custom Build-Up, W/Toyota 22re mill, and a 2005 Chevy 2500HD, Duramax/Allison TOADS Will also pull a MacGregor 26X Powersailor 2001 Model, owned since new!

Retired SR Rocket Mechanic, FT Sales Associate @  FT of California, Escondido CA.!  and Retired USMC Gunnery Sergeant (Hence Retired Guns! ) Avionics Tech, on A6E Intruder & OV-10 Bronco Aircraft!  V/N Era Vet, and Desert Storm Participant.  Happily Retired now!

Re: M-11 Alternator Belt Tension

Reply #1 –
Think they may mean belt manufacturer,Nac won't be much help in my opinion,get on some sites and find a video and as long as it's
not too tight it will not hurt the alternator.
96 U270 BUILD 4810
85 380SL
Drummonds TN.

Re: M-11 Alternator Belt Tension

Reply #2 –
It would have to be VERY loose to come off. When I took my belt off. I had to GREATLY loosen it up to remove it. I have heard that about 1/4"-3/8" deflection is good or if you can twist it 90 degrees with your fingers is also good. I would of course err on the side of slightly loose over too tight.

If the belt is vibrating wildly while idling, Then too loose.

Jerry & Nona and Kimeru the cat that thinks she's a dog
1998 36' WTFE U320  #5314 Motorcade #17711
USAF 1975-1995
2019 Subaru Crosstrek 'toad'
2003 Subaru Legacy touring car
jerry Fincher | Flickr

Re: M-11 Alternator Belt Tension

Reply #3 –
James did call just now! As said 1/4"- 1/2", is sufficient? So, he said he will be moving to another department, within the Company! He's been there 40 Years, and the Gentleman he is turning the reins over to, has Experience, but nothing what James has heard, and helped with, all these years! He said his name, but didn't recognize it?  He worked at the same Company Store in Escondido, as I did, but about a year later?  I am sure we will get the same excellent service from him, as well! Sad goodbye to James though!
Tom & Barb Root
'95, 40' U-320C SE, bought from Dave Head, 8/2017  FT Motorcade # 18196 Coach Build# 4663 October '94
2015 VW Golf Sportwagen, 1991 Suzuki Samurai, Off-Road Custom Build-Up, W/Toyota 22re mill, and a 2005 Chevy 2500HD, Duramax/Allison TOADS Will also pull a MacGregor 26X Powersailor 2001 Model, owned since new!

Retired SR Rocket Mechanic, FT Sales Associate @  FT of California, Escondido CA.!  and Retired USMC Gunnery Sergeant (Hence Retired Guns! ) Avionics Tech, on A6E Intruder & OV-10 Bronco Aircraft!  V/N Era Vet, and Desert Storm Participant.  Happily Retired now!
 

Re: M-11 Alternator Belt Tension

Reply #4 –
A belt tension gauge is a belt tension gauge, not mfr. specific.  Get the tension from the M-11 Owner's Manual.  Read the instructions with the gauge and get it done.  You don't want to use the old deflection method with ribbed belts.
Regards,
Brett

'99 42' Foretravel Xtreme
'14 Brown Motorsports Stacker
'05 Chevy SSR
'02 BMW R1150R