Volvo Penta MD1a

[Jase6100]

I think there maybe a brass nipple in the area you describe. I have passed on the information to the fella who is helping and who is nearer the boat to have a look.

Thanks again for your help.

 

[Jase6100]

MD1 engine update. We took the boat out at the weekend and the engine worked fine. It started first time out from the dock and on our return. We found a sweet spot at around 3/4 revs that pushed use along at 4.5 knots. Any more revs produced some sooty discharge and a bit of whitish smoke.

The engine stop issue is yet to be addressed. However, as a result of the suggestions and advice on this thread, I need to install an additional lever that will control the revs and enable the engine cut off to be accessed, the other lever will engage the gears.

Thanks everyone for you help.

 

[Jase6100]

Just a quick update on the MD1A renovations. I have changed the single multi function throttle/gear lever for a dual lever and this now enables the engine to shut off by powering down. The gears can be operated independently.

The next problem to reveal itself is fixing a leak from the sea water pump. I noticed some very minor drips that were coming from the drain hole that is positioned on the underside of the pump. Maybe the lip seals have perished?

 

[RichardS]

Just a quick update on the MD1A renovations. I have changed the single multi function throttle/gear lever for a dual lever and this now enables the engine to shut off by powering down. The gears can be operated independently.

The next problem to reveal itself is fixing a leak from the sea water pump. I noticed some very minor drips that were coming from the drain hole that is positioned on the underside of the pump. Maybe the lip seals have perished?

Shaft seals definitely need replacing. Depending upon design, best not to wait if possible as until you get it apart you won't be able to make a proper assessment of the shaft and bearings.

Richard

 

[Kukri]

Oil into to water - not good. Water into oil - very very bad.

 

[ghostlymoron]

I don't remember seeing a thermostat on my MD1 which had two lever controls. As said the easy way to tell the difference between MD1 and the later MD1A is that the former doesn't have an external oil filter, only a crude internal strainer.
How does the OP stop the engine at the moment? I really liked the thumping noise it made.

 

[Jase6100]

Checked the oil and it was clean. Definitely will be removing the pump and replacing the seals. It may need a full repair kit if the shaft has groves worn into it.

My engine is a MD1A it has and oil strainer.

 

[Kukri]

My 1967 MD2 had a thermostat located at the forward end of the manifold.

 

[scottie]

2 lever control only needed with RB gearbox which was used with early engines
The MS gearbox allowed single lever control but required separate stop
B engine was offered with either gearbox

 

[Jase6100]

2 lever control only needed with RB gearbox which was used with early engines
The MS gearbox allowed single lever control but required separate stop
B engine was offered with either gearbox

That’s helpful and is more information that supports the view that my engine is an early MD1A. However, I have another later version that has scarified its head and exhaust manifold to enable the one on the boat to live. Long my it continue to chug along.

 

[scottie]

That’s helpful and is more information that supports the view that my engine is an early MD1A. However, I have another later version that has scarified its head and exhaust manifold to enable the one on the boat to live. Long my it continue to chug along.

The MD1A had no separate exhaust manifold it was combined into head and a shorter injector

I would suggest that water pump should be checked as soon as possible
The very early engines may very possibly have had a greaser on the water pump but I am not certain

 

[Bilgediver]

The MD1A had no separate exhaust manifold it was combined into head and a shorter injector

MD1
I think you are getting confused. It is not surprising however. The MD 1 had a unique head arrangement where the exhaust came out of the rear of the head straight to the exhaust.

MD1A
The later Volvo 1 A However used the same components as the MD 2 A so were interchangeable and identified as having only 4 head studs . The later MD1B / 2B / 3B which could be identified by 4 studs and 2 bolts securing the heads also shared components.

MD1B

 

[Jase6100]

MD1
I think you are getting confused. It is not surprising however. The MD 1 had a unique head arrangement where the exhaust came out of the rear of the head straight to the exhaust.

MD1A
The later Volvo 1 A However used the same components as the MD 2 A so were interchangeable and identified as having only 4 head studs . The later MD1B / 2B / 3B which could be identified by 4 studs and 2 bolts securing the heads also shared components.

MD1B

 

[Jase6100]

MD1
I think you are getting confused. It is not surprising however. The MD 1 had a unique head arrangement where the exhaust came out of the rear of the head straight to the exhaust.

MD1A
The later Volvo 1 A However used the same components as the MD 2 A so were interchangeable and identified as having only 4 head studs . The later MD1B / 2B / 3B which could be identified by 4 studs and 2 bolts securing the heads also shared components.

MD1B

 

[Jase6100]

The engine on my boat is exactly like the one in the second video.

 

[scottie]

The MD1A had no separate exhaust manifold it was combined into head and a shorter injector

I would suggest that water pump should be checked as soon as possible
The very early engines may very possibly have had a greaser on the water pump but I am not certain

The injector referred is the fuel injector