engine oil - grey emulsion

D

dougpol1

.
Feb 13, 2010
528
Yes it looks like they are showing the MD2b engine Yours I believe is an MD2A. I think the MD2B is Volvo Penta and the MD2A is just Volvo. Not sure about this but the one they are showing is not your engine. My set of drawings show that the MD6A has an "o" ring and that the MD7A does not.The MD7A does not have a hole in the bottom but instead has a hose fitting so water leaking through the seals can be drained into the builge. So your pump should have an "O"ring. Now, it is possible somebody may have replaced the pump housing with one for an MD7A. If they did there will be no hole but the hose fitting instead. The earlier engine that needs the O ring is your engine. Doug

Douglas Pollard Dougpol2@...

On Sat, 10 Aug 2013 15:35:43 -0000
"marcin_palacz" palacz@... wrote:
 
D

dougpol1

.
Feb 13, 2010
528
Sure sounds like someone has had a problem before so drilled the extra hole. I guess I would put the seals in as shown. One keeps water from flowing freely into the hole and the other one keeps oil from the engine flowing into the same hole. If the second hole is between the engine and the first seal it looks like that hole would be dripping oil?? It may be that if the boat was backing fast and the exhaust pipe was under water there may have been a higher than normal pressure on the raw water system and pump and it could have pushed through worn seals faster than it could have run out of the holes so went into the engine oil. I guess its possible? Doug

Douglas Pollard Dougpol2@...
On Sat, 10 Aug 2013 18:17:02 -0000
"marcin_palacz" palacz@... wrote:
 
G

groundhogyh

.
May 30, 2006
1,075
I didnt read all these latest emails, but if you suspect the water pump, change it!

Its old as the hills and the failure mode is soft. The impeller rubs away brass untill the pump leaks inside itself. It wont pump so much water.

Rebuilding is iffy.
 
G

groundhogyh

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May 30, 2006
1,075
*-Depco. George quoted $235 for new Johnson pump. 10-35157-6(5?), Type F35B-9
This is the latest part and is not same as original. Needs two wing things
to mount on the MD6A. Cost about $10ea. 01-43238. 800-446-1656 ORDERED9/08
 
M

marcin_palacz

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Jan 17, 2005
99
Thanks for all the advice which I received from this e-mail list in
response to my grey emulsion oil problem! The problem was properly
diagnosed here, and I could fix it in Oskarshamn.
It was a leak of the raw water pump shaft. Two seals had to be changed.

To figure out the right size of the seals was not that straightforward
before dismounting the pump. The correct Volvo Penta part number of for
MD6A is 804695. The pump, its shaft, and the seals are different in MD6A
and MD7A. The seals have inner diameter of 12.7 mm (1/2 inch), outer
2.54 mm (1 inch) and are 6.4 mm thick.

Now I am at home in Warsaw and "Lotta" is moored in her home harbour of
Elbl?g. I had a good trip back, with a fast crossing of Baltic from
Kristianopel in Sweden to Sopot in Gda?sk Bay, Poland: 156 nm in 30
hours. Altogether, it was a 1.5 month long trip, first at the Polish
Baltic coast, and then in the archipelagos of the eastern Swedish
coast, from Kalmarsund to Nynashamn.

Marcin
V1958 "Lotta"
 
S

stevebirch2002

.
Nov 8, 2001
1,818
Hi

These seals are "Imperial" 1" x 1/2" x 1/4"

Glad it's all fixed.

Cheers Steve BFrom: Marcin Palacz
Sent: Wednesday, August 21, 2013 5:24 AM
To: AlbinVega@yahoogroups.com
Subject: Re: [AlbinVega] engine oil - grey emulsion

Thanks for all the advice which I received from this e-mail list in
response to my grey emulsion oil problem! The problem was properly
diagnosed here, and I could fix it in Oskarshamn.
It was a leak of the raw water pump shaft. Two seals had to be changed.

To figure out the right size of the seals was not that straightforward
before dismounting the pump. The correct Volvo Penta part number of for
MD6A is 804695. The pump, its shaft, and the seals are different in MD6A
and MD7A. The seals have inner diameter of 12.7 mm (1/2 inch), outer
2.54 mm (1 inch) and are 6.4 mm thick.

Now I am at home in Warsaw and "Lotta" is moored in her home harbour of
Elbl?g. I had a good trip back, with a fast crossing of Baltic from
Kristianopel in Sweden to Sopot in Gda?sk Bay, Poland: 156 nm in 30
hours. Altogether, it was a 1.5 month long trip, first at the Polish
Baltic coast, and then in the archipelagos of the eastern Swedish
coast, from Kalmarsund to Nynashamn.

Marcin
V1958 "Lotta"
 
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