Recirc pump/pulley problem

[Cuda]

You may remember I had belt trouble on the Suwannee trip. I got home and found the four bolts that hold the pulley on were loose. I tightened them up and it made a horrible noise, I thought that maybe I had beat the bearings out of the brand new water pump.

Today, we pulled the pulley off, and I think I found the problem. The pulley was rubbing on the water pump.

[Cuda]

My first thought was to dremel some metal off the pump. Then I thought of using the dremel to take some metal off the pulley. Then I tried to figure out why it was hitting. I knew I couldn't space the pulley out from the pump or the belts wouldn't line up. Upon further inspection, I could see where someone had tightened the pulley down without it being lined up with the knob in the end of the pump.

I don't know it it shows in the picture, but that is a straightedge laid across the pulley. There is a crown in the center. Hard to see with no backlighting.

[Cuda]

Somewhere that I don't recall, I came into possesion of another pulley. The backspacing is the same, but the pulley is bigger. This pulley is brand new.

[Cuda]

The diameter of the old pulley is 5.5", and the new one is 7".

Can I just buy longer belts and use it, or will it cause the pump to turn too slow?

[Cuda]

I just looked up a price on a new pulley, this has got to be wrong!


5 15120T PULLEY, WATER PUMP (3 GROOVE) 1 $685.70 $651.42

[gcarter]

You know when I bought my Minx, it had a Stainless Marine bypass in place of the pump. You might have to conclude the pump is redundant.

George :confused:

[Cuda]

I had nothing better to do tonight, so I stuck the big pulley on. I was worrying about it clearing the crank pulley, but everything fits. I just need to get a longer alternator belt, and I'll keep a sharp eye on the temp guage. The PS belt was still long enough. :)

[Cuda]

You know when I bought my Minx, it had a Stainless Marine bypass in place of the pump. You might have to conclude the pump is redundant.

George :confused:

Good point George. Did yours only have the Alpha pump and no sea pump?

[JimG205]

Hi Joe-As long as your pulling and pushing water and the pulley spins true it should be fine.Are you still breaking in the new motor? Regards,Jim :boat:

[gcarter]

Yes, drive pump only.
Of course eveything's changed now.

George

[Cuda]

Hi Joe-As long as your pulling and pushing water and the pulley spins true it should be fine.Are you still breaking in the new motor? Regards,Jim :boat:

Yep, I might have 1.5 hours on it. Hopefully will improve on that this weekend. :)

[gcarter]

Joe, you know I believe Jim is right, the relative speed is not very important. I think they make different sizes to accomodate different operating scenarios; small pulleys for low speed operations, large for high speed.

George

[DONZI]

There are also shim kits available.

http://store.summitracing.com/default.asp?target=esearch.asp&N=110&Ntk=KeywordSearch&Ntt=water+pump+shim&x=13&y=11

[BUIZILLA]

With the Alpha water pump supplying the circ pump, I believe it's a non-issue with the pulley diameter in this situation. If it was an issue, then running with the SSM bypass would be evil thoughts.....

JH
luver of my SSM 454 bypass apparatus

[Cuda]

There are also shim kits available.

http://store.summitracing.com/default.asp?target=esearch.asp&N=110&Ntk=KeywordSearch&Ntt=water+pump+shim&x=13&y=11


Wouldn't that put the pulley out of alignment?

[MOP]

Jim do you know what the real HP gain is with a bypass, I know you run the Meziere pumps on your race cars the HP gain should be similar percentage wise. I have read the ads some tout some pretty high gains just how much is real. True input appreciated.

Phil

[BUIZILLA]

I would be surprised if there was mopre than a 5-7 hp loss with the stock circ pump, depending on which engine combo it is. Just my .02

JH :umbrella:

[MOP]

Thanks Jim then basically all you really gain is some simplicity and one less thing to let you down. If raw cooled the bypass still sound like a decent idea.

Phil

[gcarter]

Well we will be able to figure this out soon! :fire:
I won't say more.

George

[DONZI]

Wouldn't that put the pulley out of alignment?
Joe, The shims come in small increment sizes.Sometimes it only takes a small amount to rub.You do have to watch alignment also.

[Cuda]

Ok, got the belt on, I had to go 1.5 inches longer on it. Everything looks good. I wanted to work on the switches and find out why my bilge blower doesn't work. When I put on the blower, the sternlight comes on. Talk about tight places, that's a b!tch getting up under the dash. :bawling:

[gcarter]

Joe, it's a lot easier to get under the dash if you remove the drivers seat first.
How do I know this? :banghead: :bonk: :bawling:

George

[Cuda]

I'm afraid to pull the seat, because then sure as hell, I'll find something else I'll want to do before putting the seat back, and I want to use the boat this weekend. :)

[MOP]

It is worth pulling the seats off the posts once a season to lube the post and slide guts.

[gcarter]

I had to replace my slides because no one else did that! :banghead:

George