irwiny

I'm working on a 65 with a crate 350, no PS or AC. The alternator is located on the passenger side. The water pump pulley and crankshaft have two belt groves. We had just replaced radiator and hoses.. We used the first belt grove for the alternator closest to the engine. The belt was too close to the lower radiator hose and caused a leak. As a result we need to replace the lower hose again.

What would be the best way to correct this belt rubbing issue? I'm planning to offset the alternator or the bracket more towards the radiator, but should i try keeping the belt on the inner or outer puller grove?

Thanks in advance for your suggestions.
Irwin

SnuffSmith

Irwin,

Check and see if you flip the lower radiator hose the other way it might be your issue. My alternator belt is on the forward pulley groove on my 327/365.

-Snuff

C2Scho

Typically on most C2 engines (both SB and BB) if you have a crankshaft pulley on your engine with more than one groove, (and most do) the inner most groove (closest to the front of the block) is always used for what some term "the captured belt". This belt goes between the crankshaft pulley and the water pump pulley only and is usually the most difficult belt to put on since there is no adjustment mechanism to help in the fitment.

I attached a picture of a typical belt setup for an engine with no PS or A/C, although for your engine, the alternator would be on the other side. Notice the positioning of the captured belt and the alternator belt. Hope this helps. C.J.

jim lockwood

^^^^THIS^^^^

WP belt goes on the forward sheaves of the WP and crank pulleys. Also, the lower hose will go on both ways BUT, if it's installed reversed, the belt will rub. So check for proper installation.

plaidside

Here is the alternator setup on my 64. Maybe you can use this style pulley with the built in spacer to be able to use the outside grooves on the pulleys.

leif.anderson93

Joe,
FYI, your upper alternator bracket should be mounted on the backside of the alternator boss with the bolt and washers entering from the back side. See picture of my '67.

plaidside

Thanks, as you all know I just got the car and I am sorting through the issues with it. I will change that when I get a chance but right now I am doing wife stuff.
Joe

irwiny

SnuffSmith - I think your correct about the hose being backward. We are trying to get a replacement now. With regards to the alternator belt ( Assuming you don't have PS, AC or Air) being on the forward grove of a dual grove pulley, is there a belt on the inside between the water pump and crank and pulley on your alternator a dual or offset to fit outer grove?

Irwin

irwiny

Thanks everyone for the images and replies, now to the next set of questions ...

After further review, this 65 had originally a 365 HP engine and now has a crate 350 installed. The lower radiator hose most likely installed the wrong way when I replaced the colling system and I'm trying to get a replacement now.

With regards to getting the belt layout corrected:
The dual pulley ( wp and crank ) set were most likely put back on this 350. With the current alternator belt on the inner grove and nothing on the outer grove, I noticed there is no belt between the water pump and crank? Apparently on 65 with 365 there is a inner WP-Crank belt and the alternator uses a different pulley allowing the belt to mount on the outer pulley. I also noticed of belt diagrams for C2 with this setup (alternator only) only one belt is used and nothing for the wp-crank and no offset alternator pulley is needed.

So if the original engine is gone (were really not trying to keep it original) and there is a 350 installed now with dual grove pulleys, what would be best:
1) continue only one belt between WP/crank/alternator using the inner pulley ( assuming the new lower radiator hose doesn't rub the belt )
2) change the alternator pulley, since there is no idler pulley, there is no need to add wp/crank belt .

Also, the car was always running hot before with a aftermarket copper aftermarket radiator + flex fan. We replaced it with a heavy duty Dewitt + fan clutch + fan and the car now runs around 180.

Thanks.. Irwin

AZDoug

That pulley is quite large, does it charge below 1000 RPM?
Doug

silver837

All SHP engines had an Idler pully for the water pump to crank pully .

irwiny

I think only 63-65 had the idler puller. Corvette Central only list one from 63-65 and my 66 L79 doesn't have one. https://www.corvettecentral.com/c2-6...ept-air-302075

silver837

So if I understand you , the car is a 65 but it has a newer 350 engine in it ?

irwiny

Yes a crate 350 engine.
Irwin

silver837

Just spitballing here , I would think that the LT 1 would have the two belt system for the WP/Crank pulleys.
Do you have access to an old Corvette parts book that was used by the dealers ?

plaidside

Yes

woodsdesign

I installed Vintage Air on my 65 coupe years ago so my AC pump is on the pass side. The belt was close to the lower radiator hose to the point that there were rub marks but did not damage the hose. This is what I installed. I believe it is from an 80 corvette.