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Old 04-09-2015, 21:59   #1
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MD17D raw water pump rotation

G'day!

I've been rebuilding the WP on my MD17D and totally neglected to pay attention at the direction of rotation of the pump's shaft when I took it out and pulled it apart.. I believe it's meant to be clock-wise (looking at the WP), can someone confirm this is the case?

Also, if anybody knows, what dives the WP, gears from the crank or cam shafts..?

thanx

lm
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Old 05-09-2015, 06:26   #2
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Re: MD17D raw water pump rotation

I don't think this is something you can change... if you have the same pump on your MD17D as I have. Is this the fresh water cooled after market kit or the raw water cooled? The fresh water circ pump is the front of the engine... the RW is the one on the rear under the oil filter.

If it's the pump that mounts on the aft side of the engine and had a slide on finned rubber impeller... you can figure out the rotation and the direction of flow by following the pipes and hose from the thru hull through the strainer and so on. But the impeller will adapt itself the the direction the shaft turns!
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Old 05-09-2015, 06:56   #3
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Re: MD17D raw water pump rotation

Although the pump maker will say it's best practice to install the impeller with the vanes in the correct direction, if you do get it wrong, the vanes will sort themselves out as the shaft turns.
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Old 05-09-2015, 07:09   #4
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Re: MD17D raw water pump rotation

The sea water pump is driven by the end of the camshaft.

DougR
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Old 05-09-2015, 07:29   #5
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Re: MD17D raw water pump rotation

Im, here's how I remember the rotation direction.

Note in Sandero's picture the inlet and outlet fittings are offset to one side of the pump housing.

The flow path takes the "long way around". So, identify the inlet and the long way around to the outlet.
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Old 05-09-2015, 09:02   #6
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Re: MD17D raw water pump rotation

Great replies, thanx all..

yes, Sandero, raw water pump, exactly like your picture, I should have taken a picture too..!

got it, bending the fins the right way is not important but if you know the right way, well why not.

One trick I saw on another forum, when reinstalling the impeller, is to use a cable tie to "squeeze" the fins, insert the impeller and then cut the cable tie.. it makes it easy when it's hard to see what you're doing, like in my case

Four Winds, so, impeller rotates CW, picks up water from inlet (LH side port, from the ocean via the gearbox), pushes it up "around the long way", as you said, and down/out the RH port to the exhaust manifold (and through cylinder jackets, heads, thermostat and out to the wet exhaust elbow, back to the ocean).

DougR, got it, end of camshaft.. I have the MD11/17 Workshop Manual (a whooping 40 pages of it) but couldn't see any detail of the camshaft, timing gear etc and how it all fits together, are you aware of the existence of any kind of detailed exploded view of these motors?

Finally a little contribution, part numbers of parts replaced and tips:

Lip seals - GACO DPSM-12247 (12mm ID, 24mm OD, 7mm thick)
Bearings - NACHI 6001-2NSE9 (12mm ID, 28mm OD, 8mm thick)

both items are pretty standard with many equivalent P/Ns from other Mfgs..

When pressing the new bearings onto the shaft, the distance between end of shaft and inner race of closest bearing is 15mm.

It goes without saying that you want to press on the inner race (bearing-onto-shaft) and outer race (bearings-into-seat).. use sockets of the appropriate size

regards

lm
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Old 05-09-2015, 19:05   #7
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Re: MD17D raw water pump rotation

For exploded views, see the VP parts books. You can find this at marinepartsexpress.com or volvopenta parts Europe

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Old 05-09-2015, 19:10   #8
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Re: MD17D raw water pump rotation

Oh, forgot to mention,

the WP P/N on my MD17D (S/N >17973) is a Johnson Pump AB (made in Sweden)
model F4B-9 P/N 10-35098-1.

Not 100% sure about the the VP P/N.

Also found this "How works" clip from JABSCO clearly showing the "long way around"..
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