Motor Muffs

fortyfreak9 · Apr 17, 2009

So when using the motor muffs, what can happen to the water pump/lower unit, with all that water rushing in. Obviously your water pump wouldnt be taking in the amount of water or under that pressure in the lake. Can those muffs blow the seals? Thank you.

sschefer · Apr 17, 2009

Re: Motor Muffs

Not if you water pressure is normal. The muffs will lift away and leak out the sides before the seals would blow unless they are already shot.

cbavier · Apr 17, 2009

Re: Motor Muffs

Only turn the water on so as to have a good flow out of your lower unit. Probably about 3/4 on the Faucet. Also don't Rev the engine too high.

capt sam · Apr 18, 2009

Re: Motor Muffs

well when you're going 30-40mph the water is rushing in, it's fine just don't rev over 1500 rpms while on the muffs.

cbavier · Apr 18, 2009

Re: Motor Muffs

capt sam said:
well when you're going 30-40mph the water is rushing in, it's fine just don't rev over 1500 rpms while on the muffs.

I don't believe this is true. The Impeller pumps the water through the Unit. Too much water pressure will blow the seals. My owners manual Mercruiser Alpha One says not too turn the faucet on all the way as damage can incur.

Silvertip · Apr 18, 2009

Re: Motor Muffs

I have not seen a set of muffs that will hold anything near 20# of water pressure. Many outboards run upwards of that so no -- household water pressure will not damage anything unless some other means of holding the muffs on the engine is used to prevent them from popping loose. Besides wasting water, full water pressure makes running the motor a very wet process. As for Merc warning about high pressure, don't you think they are just covering their behinds? There is always someone who will devise a leakproof set of muffs and we all know someone who thinks if a little pressure is good, a bunch more must be better.

kenmyfam · Apr 18, 2009

Re: Motor Muffs

I don't believe you will get excessive pressure from a household supply. As said above any excess will leak out from the cups.

Navy Jr. · Apr 18, 2009

Re: Motor Muffs

I believe the comment regarding turning the faucet too high pertains more to motors that have a direct water hose connection than it does to muffs.

kenmyfam · Apr 18, 2009

Re: Motor Muffs

Navy Jr. said:
I believe the comment regarding turning the faucet too high pertains more to motors that have a direct water hose connection than it does to muffs.

Good point.

cbavier · Apr 18, 2009

Re: Motor Muffs

Silvertip said:
As for Merc warning about high pressure, don't you think they are just covering their behinds? There is always someone who will devise a leakproof set of muffs and we all know someone who thinks if a little pressure is good, a bunch more must be better.

Yea your probably right. Like Tim the Tool Man Taylor - "More Power"

cribber · Apr 18, 2009

Re: Motor Muffs

I always warm my motor up on muffs before heading to the ramp and haven't had any issues. As long as you follow the manufacturer's direction you should be okay. I don't use the direct connection inside the engine compartment since it's a hassle hooking up the hose and my household water pressure at the pump is 45 -55 PSI and well above 30 PSI at the hose.

I just slap on the muffs and crank the faucet enough so water comes out the sides of the cups.

fortyfreak9 · Apr 18, 2009

Re: Motor Muffs

Alright, I have used the muffs in the past but always wondered that could happen. Sounds like everything is good just watch the RPM's.

Dhadley · Apr 18, 2009

Re: Motor Muffs

"Blow the seals". Which seals?

saumon · Apr 18, 2009

Re: Motor Muffs

The seals that the water can reach are the bottom crankshaft seals if the driveshaft houshing fill up with water, the seals under the water pump base and the shift shft seal.

But, to blow a seal, you have to build enough pressure in the driveshaft housing, wich won't happen because it's not sealed...

Dhadley · Apr 18, 2009

Re: Motor Muffs

None of those seals are affected by pressure from the water pump no matter how much pressure the pump creates.

saumon · Apr 18, 2009

Re: Motor Muffs

Dhadley said:
None of those seals are affected by pressure from the water pump no matter how much pressure the pump creates.

I know, but we're talking about the muffs, and they're affected by the pressure of the water entering the driveshaft housing that, BTW, is not even near to make them blow.

Dhadley · Apr 18, 2009

Re: Motor Muffs

The water pressure from the hose thru a flushette does not affect those seals at all. No matter how high the hose pressure is.

saumon · Apr 18, 2009

Re: Motor Muffs

Sorry, but i don't understand! Where did the water that goes past theses seals when they're shot or worn came from if it's not from the "leg" (driveshaft housing)?

I've always tought that the water could enter the pump via the slot in the base but can also surrond it.

Dhadley · Apr 18, 2009

Re: Motor Muffs

If those seals, not including the lower crank seal, are bad water will leak past them just because they're submerged. It has nothing to do with water pressure, no matter where the water pressure comes from.

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