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TOPIC: water pump pulley 5.7

water pump pulley 5.7 05 May 2009 01:10 #1

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Hi guys, long time lurker, first time poster. I'm attempting to resurect a 1985 2850 contessa command bridge. Started the engine, and it seemed that the engine circulating pump pulley was banging into the water pump. I removed the pulley, and the water pump seemed to turn ok, so it looks like the pulley is bad (lot of rust on the back). My question is whether or not this pulley is something I can pull from an auto junkyard, auto parts store, or if not, what is the part number I need to be searching for on ebay. This pulley is double grooved, single belt. Thanks

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water pump pulley 5.7 05 May 2009 01:23 #2

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water pump pulley 5.7 05 May 2009 01:52 #3

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1. Is the pulley a baklite plastic material? They fail due to being a car type that is not built for the high rpms of a boat engine.
2. You can replace it with a metal one but most every metal one is about 1" bigger than the original. So, you will need to get a longer belt.
3. Make sure the extra sized pulley will fit under the engine cover when closed.

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water pump pulley 5.7 05 May 2009 02:18 #4

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1985 2850 contessa command bridge.
Volvo Penta?
Do you need the double shiv?

If so, hang in.... I'll get you a GM p/n

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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set

water pump pulley 5.7 05 May 2009 03:45 #5

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Definitely metal, well rusted on the inside, which may have may have made it spin a little funny?

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water pump pulley 5.7 05 May 2009 03:47 #6

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It's double groove, only outer is used for alt and crank.

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water pump pulley 5.7 05 May 2009 04:14 #7

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Grab some diameter #'s and a depth I changed over my 350 to a trick serpentine system and have fresh water pulleys available

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water pump pulley 5.7 05 May 2009 04:14 #8

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OK, I was able to get one out of two questions answered :rolleyes:....
:kidding

I know this is a 1985 2850 contessa command bridge... but what model engine/drive?

Volvo Penta Engine/drive ?
Ford Pinto?
John Deer?
Briggs and Stratton?

Now it should be Volvo Penta and a SBC marine engine.
If volvo penta, does it have the Crankshaft Raw Water pump?

..

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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set

water pump pulley 5.7 05 May 2009 04:19 #9

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350 cid chevy (or 5.7 in title), raw water cooled

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water pump pulley 5.7 05 May 2009 04:24 #10

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is it a merc or OMC chebby? dial Rick in with all his q's and He'll set u up

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water pump pulley 5.7 05 May 2009 04:32 #11

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It' s a Volvo Penta 280, afaik, 350 chevy (5.7), I'm thinking this should be a cheap and readily accessible part, am I wrong?

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water pump pulley 5.7 05 May 2009 05:13 #12

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Scott, it is a Chebby!


It should be a single shiv old style chevy circ pump pulley. GM p/n 3927797AF

Here is that M/C pulley that's on auction.... WOW.... $150!!!! New, over $300 :eek:

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I have the single shiv pulleys on my boat...... Port pulley the F is not clear..... on the Stbd it appears to be an F.

In a double shiv (of which I have in my shop), it will be GM p/n 3942992BA

The B on the double shiv could be an 8 if you come up short on that GM part number.

Pretty sure that those are correct.

.

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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set

water pump pulley 5.7 05 May 2009 23:36 #13

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he states it's a 2 groove? but if it doesn't drive anything else?/ why

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water pump pulley 5.7 06 May 2009 00:21 #14

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Both crank and water pump pulley are double grooved, you're right, only outer groove is used. Concerned about whether the single groove water pump pulley will line up with both crank AND alternator.

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water pump pulley 5.7 06 May 2009 00:29 #15

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water pump pulley 5.7 06 May 2009 00:35 #16

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that link showed tension pulleys for a timing belt?

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water pump pulley 5.7 06 May 2009 00:50 #17

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Scroll down; ebay stores.

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water pump pulley 5.7 06 May 2009 04:27 #18

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We be talk'n dis suck'a for $75?

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Or the single?

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I'll bet either can be picked up and an auto wrecking yard.


I'm curious as Scott is... if you don't need for fwd shiv.... why buy a double?

.

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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set

water pump pulley 5.7 07 May 2009 02:51 #19

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I obviously don't need a double; the question is, whether or not a single lines up in the same plane as the outer on the crank (also a double), and the alternator.

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water pump pulley 5.7 07 May 2009 03:09 #20

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Well, I'm almost certain that when comparing the single to the double, that the rear most shiv of the double is placed in the same relative position as the "only" shiv is on a single pulley..... (holly cow... did that even make sense? :rolleyes:)
IOW's, if you were to measure from the Circ Pump mounting flange surface to the rear most shiv.... it would appear that both rear most shivs would align with one another! This would make the second shiv fwd of a single shiv position.

Most of these that do not have P/S (for example) use the single on the circ pump. The double will no doubt work and take the guess work out of it!

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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set

water pump pulley 5.7 07 May 2009 12:42 #21

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2850Bounty;292016 wrote: Well, I'm almost certain that when comparing the single to the double, that the rear most shiv of the double is placed in the same relative position as the "only" shiv is on a single pulley..... (holly cow... did that even make sense? :rolleyes:)
IOW's, if you were to measure from the Circ Pump mounting flange surface to the rear most shiv.... it would appear that both rear most shivs would align with one another! This would make the second shiv fwd of a single shiv position.

Most of these that do not have P/S (for example) use the single on the circ pump. The double will no doubt work and take the guess work out of it!



I am not sure wich is worse. That you said all that, or that I understood it!:kidding

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1975 2350 Command Bridge
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water pump pulley 5.7 07 May 2009 12:53 #22

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Skagit_Prince;292079 wrote: I am not sure wich is worse. That you said all that, or that I understood it!:kidding

I know....You are so right! It got me to think'n about that too! :kidding

(I honestly think that I had more trouble writing that than I've had for a long time! It still doesn't sound right! :hammer )

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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set

water pump pulley 5.7 20 Jun 2009 20:03 #23

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I can't believe that it's been so difficult tracking down this simple part, without which, no splash! I purchased p/n 3942992 from ebay, but this pulley is a little deeper (hits water pump inlet, and outer groove slightly misaligned). Does the ba at the end of the Volvo p/n mean something? Anybody have one?

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water pump pulley 5.7 20 Jun 2009 22:22 #24

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Brad at Fairview Marine has several of these. I was there just the other day and had three/four of them in my hand.
I even have a double shiv of the same style right here in my shop.

Either of us should be able to supply you with this very common pulley.

Give a holler if you want one.
If you PM me, give me an email address... I don't much care for the PM system.

Rick

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Rick E. Portland, Oregon
2850 Bounty Sedan Flybridge model
Twin 270 HP 5.7's w/ Closed Cooling
Volvo Penta DuoProp Drives
Kohler 4 CZ Gen Set
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