JustinD

I took out the A/C system in my 78 and I need to run a belt from the crank to the water pump. I've now tried a 36x17(to big), 36x15(to big) 35x17(to small) and a 35x15(to big). There are no more belts left to try and I'm sick of running back and forth to the parts store. Help me please I'm gonna go crazy.

Star79

On non-A/C cars (my 79 anyway...) the water pump belt goes around crank/water pump/alternator. No way to use just crank/pump, how would you adjust tension? Or am I reading your description wrong??

JustinD

When I tried it with just the crank water pump alternator belt it sounded like it was slipping I looked in my corvette maunal for a belt diagram and I saw that with no a/c there was a belt around the crank and the pump. So I'm just going by the picture in the book.

turtlevette

this is an interesting question.

Without the A/c compressor belt a breakage of the alt belt means instant overheating and possible engine damage.

Even a loosly mounted crank to water pump belt would be better than no backup at all.

CheezMoe

My 73 car has said belt. They have it at ZIP and probably other Corvette supply houses.

http://www.zip-products.com/Zip/prod...60F3E9DBB06C99

BKarol

On my 78, no ac:

7320 Gates XL 10A0815 (crank to pump)

2nd belt to ps

3rd belt to alt

turtlevette

How do you put on a belt from the crank to water pump. There is no tensioner pulley.

vho69

neoh77

I have said belt on my 77' with no a/c. One around the crank and water pump, one around the crank, waterpump, power steering, and alternator.

I undo the alternator belt, remove the mechanical fan (mine is electric now), and slide the water pump puley off. Belt comes right along with it! Reverse to replace. It doesn't seem to have a lot of tension on it, but it may not need too much since it has a contact patch of almost half the pulley. The one going to the alternator barely catches the water pump, perhaps 30 degrees of it.

-Matt

Kid Vette

Yep, there is always a belt between the waterpump and crank when no AC/no PS. I just get the belt started on the WP pulley, then bump the engine over with the starter (coil wire disconnected) and it pops right on.

rihwoods

Just checked my 69 AIM...they show various belt configurations...including a belt from crank to waterpump (no A/C-PS) on the 350 engine..
Rich

turtlevette

Its that simple.

This extra belt would have saved me from overheating and warping both heads on the way to Mt. Tremblant last summer.

i am an idiot.

i will have my mistress give me 40 additional lashes this week.

JustinD

Well I found the correct fitting belt 34.5x17. Took alot of messing around and swearing but I got it to work.

turtlevette

is that size in inches? The belts i've seen are in metric.

34.5" * 25.4 = 876mm ???

w1ctc

I see you found the right size. I used a Advanced Auto Dayco 15345

SmokinBBC

Glad you got it to work

My 70 BB has an idler pulley to adjust the tesion. It is located on the drivers side halfway between the crank and the waterpump.


Here it is at Zip:

69-74 427/454 W/AC IDLER PULLEY
Product Number: M-2337

I'm Batman

Everyone keeps ditching their A/C sytems...I don't get it.

turtlevette

they don't work on our cars, so why carry the extra weight?

I'm Batman

I'm in the "fix, don't scrap" school of thought.

turtlevette

how many weeks of the year do you really need a/c where you live. Its not worth it for me.