1967 fan clutch

[Jeremy H.]

Who sell the correct looking eaton fan clutch? The one thru Napa doesn't look correct. I know there is one that only looses a few points.

Thanks

Jeremy Hedges
#31711

[Joe L.]

Re: 1967 fan clutch

Who sell the correct looking eaton fan clutch? The one thru Napa doesn't look correct. I know there is one that only looses a few points.

Thanks

Jeremy Hedges
#31711

Jeremy-------



GM #3916141. Available from GM or most of the Corvette parts suppliers like Dr. Rebuild, Paragon, etc. It carries a GM list of about 275 bucks at the present time.

[David L.]

Re: 1967 fan clutch

Who sell the correct looking eaton fan clutch? The one thru Napa doesn't look correct. I know there is one that only looses a few points.

Thanks

Jeremy Hedges
#31711

Jeremy,

I found this NOS 6" dia. fan-clutch for cheap money ($10) at Fall Carlisle 2009. It is the closest match to the coil type fan-clutches that were made in the early and mid 1960's that I have ever seen. The bolt circle on the hub measures 1.75". The front face is ink stamped "FC-16" and "H28J" (possibly August 28, 1979). This fan-clutch has 2 "small ears" on its face. The coil type fan-clutches made starting about 1969 or so have 2 "large ears". One problem with this fan-clutch is that it will only fit fans with a 3.25" bolt circle. It will not fit on a 61-67 Corvette fan with the 3.00" bolt circle. Another problem with this fan-clutch is that the shaft is about 0.42" too long, I think. The measurement from the water pump mounting surface to the fan mounting surface is about 2.20". This same measurement on my original 1966 Corvette (Schwitzer type w/ bar strip) fan-clutch dated "SC 1 26 66" is about 1.78".

Dave

[Joel F.]

Re: 1967 fan clutch

Jeremy,

this is the fan clutch you are looking for.

http://cgi.ebay.com/ebaymotors/60-70-Chevrolet-Corvette-Fan-Clutch-GM-3916141-New-OEM_W0QQcmdZViewItemQQhashZitem5190efe129QQitemZ350323990825QQptZMotorsQ5fCarQ5fTruckQ5fPartsQ5fAccessories

[David L.]

Re: 1967 fan clutch

The NORS (not NOS) 3916141 fan-clutch in the Ebay auction for $175 is a replacement. This fan-clutch has the "large ears" on the face side which did NOT exist in 1967. If I was a NCRS judge I certainly would notice that it was not original equipment. Maybe some of the "rookie" NCRS judges would not notice. You can always spend $175 and hope.

[Joel F.]

Re: 1967 fan clutch

The NORS (not NOS) 3916141 fan-clutch in the Ebay auction for $175 is a replacement. This fan-clutch has the "large ears" on the face side which did NOT exist in 1967. If I was a NCRS judge I certainly would notice that it was not original equipment. Maybe some of the "rookie" NCRS judges would not notice. You can always spend $175 and hope.

Good points David, but I believe he is looking for the replacement as he said he knows it will lose a few points.

[John H.]

Re: 1967 fan clutch

GMPartsDirect.com has them for about $160.00 (plus shipping).

[John D.]

Re: 1967 fan clutch

John,
The GM cost went up to $157.28 as of 3/1/10. So the partsdirect website is very close to dealer cost on the price. If I remember correctly the ebay seller used to have the best price on these around $100 or so...don't know what happened there.

[Joe L.]

Re: 1967 fan clutch

The NORS (not NOS) 3916141 fan-clutch in the Ebay auction for $175 is a replacement. This fan-clutch has the "large ears" on the face side which did NOT exist in 1967. If I was a NCRS judge I certainly would notice that it was not original equipment. Maybe some of the "rookie" NCRS judges would not notice. You can always spend $175 and hope.

David------


The GM #3916141 was a 1968 model year released part. The original version of it had the "small" reservoir extensions (ears). Somewhere along the way, its configuration was changed in several ways, including the reservoir extensions.

While the current 3916141 is not exactly correct, it's as close as one can get in a NEW fan clutch for 1960-1970 Corvettes. The only other options are NOS or restored original. For a driver which is also entered into NCRS judging, I highly recommend the 3916141.

[David L.]

Re: 1967 fan clutch

David------


The GM #3916141 was a 1968 model year released part. The original version of it had the "small" reservoir extensions (ears). Somewhere along the way, its configuration was changed in several ways, including the reservoir extensions.

While the current 3916141 is not exactly correct, it's as close as one can get in a NEW fan clutch for 1960-1970 Corvettes. The only other options are NOS or restored original. For a driver which is also entered into NCRS judging, I highly recommend the 3916141.

Joe,

Actually the 3916141 fan appears in my 1967 Chevrolet Parts Catalog (effective April 1967) for a 67 PASS. (Air Cond., fan drive)(6 cyl.) and 67 PASS. (396)(427). As far as I know it was only used as a REPLACEMENT for the Corvette models, never original equipment on any Corvette model year.

I agree with you that it is the most practical fan-clutch to use.

Dave

[Joe L.]

Re: 1967 fan clutch

Joe,

Actually the 3916141 fan appears in my 1967 Chevrolet Parts Catalog (effective April 1967) for a 67 PASS. (Air Cond., fan drive)(6 cyl.) and 67 PASS. (396)(427). As far as I know it was only used as a REPLACEMENT for the Corvette models, never original equipment on any Corvette model year.

I agree with you that it is the most practical fan-clutch to use.

Dave

Dave------


Yes, it was definitely released in late 1967. I thought this was for the 1968 model year, but I didn't check it. I now see that it was cataloged for 1967 application. It must have been a very late use, though.

I believe it was used in PRODUCTION, though, for Corvettes during the 68-69 period, although its use may have been limited to L-88/ZL-1. It later became the SERVICE fan clutch for all 1960-70 Corvette applications.

[David L.]

Re: 1967 fan clutch

Dave------


Yes, it was definitely released in late 1967. I thought this was for the 1968 model year, but I didn't check it. I now see that it was cataloged for 1967 application. It must have been a very late use, though.

I believe it was used in PRODUCTION, though, for Corvettes during the 68-69 period, although its use may have been limited to L-88/ZL-1. It later became the SERVICE fan clutch for all 1960-70 Corvette applications.

Joe,

According to the 68 & 69 Corvette assembly manuals the L36, L71, and L88 used a 3937771 fan-clutch. However, I have in my notes that the 68-T-9 Chevrolet Technical Service Bulletin (dated 12/27/67) shows the 3857530 & 3857531 fan-clutches to be used.

The 66 & 67 Corvette assembly manuals do not list a part number for the 427 fan-clutch but my 1967 Chevrolet Parts Catalog lists GM # 3857530 as the fan-clutch for the 66-67 Corvette (427).

My 1968 Chevrolet Parts Catalog (Oct. 67) does NOT list a fan-clutch for the 68 Corvette (427) but my 1969 Chevrolet Parts Catalog (Oct. 68) does list GM #3916141 for the 68-69 Corvette (427)(exc. C.A.C.) and GM # 3857531 (stamped CT) for the 66-67 Corvette (427), 68 Corvette w/C.A.C.(427)(exc. 3X2).

My 1969 Corvette Parts Catalog (Sept. 69) lists GM #3916141 (stamped CK) for the 68 Corvette w/H/Per.(427)(1st design)(exc. C.A.C., 3X2), 68 Corvette w/Sp.H/Per (427)(1st design), 68-69 Corvette w/H.D.(427). It also lists GM #3937771 for the 68-69 Corvette w/H/per.(427)(2nd design)(exc. 3x2), 68-69 Corvette w/Sp. H/Per. (427)(2nd design), 68-69 Corvette w/C.A.C.(exc. 427 w/4BC), 69 Corvette w/H/Per.(350), 69 Corvertte w/A.T.,H.D. (427).

So, the 3937771 fan-clutch as shown in the 68-69 assembly manuals does make an appearance in the Sept. 69 parts catalog.

It's a bit confusing but you might be right about the 3916141 fan-clutch being used on the production line as a "1st design" fan-clutch, I think, but I am not 100% sure.

Well, I think we beat this topic to death.

Dave