rich201283
Well-Known Member
We have discovered there is oil running off the back of the sump, It seems to be dripping off the back edge, When we had the engine out the flange gasget looked okay, Any ideas?
Volvo penta md2b oil leak
- Thread starter rich201283
- Start date
VicS
Well-Known Member
If it's leaking when not running it is the sump drain plug.
If its leaking when running it could be almost any seal or gasket, the rear crankshaft oil seal even. Clean everything down very throughly then run it to see where the oil is coming from
If its leaking when running it could be almost any seal or gasket, the rear crankshaft oil seal even. Clean everything down very throughly then run it to see where the oil is coming from
PeterGibbs
Well-Known Member
Replying in general terms, a rear crank oil seal is a prime suspect if, as said above, the oil emerges only when running. In some engines, the oil is thrown about by the flywheel and escapes though the dry seal on the flywheel housing.
This seal is not likely to disintegrate overnight but, depending on installation, could involve some dismantling / removal of gearbox to get at it. Back to the engine handbook!
PWG
This seal is not likely to disintegrate overnight but, depending on installation, could involve some dismantling / removal of gearbox to get at it. Back to the engine handbook!
PWG
PeterGibbs
Well-Known Member
"in some engines" was the qualifier...
So perhaps we are both right..
I could add that oil might be escaping down the back of the engine from the rocker cover? Can you buy that?
PWG
So perhaps we are both right..
I could add that oil might be escaping down the back of the engine from the rocker cover? Can you buy that?
PWG
VicS
Well-Known Member
[ QUOTE ]
from the rocker cover? Can you buy that?
[/ QUOTE ] Yes, either of them for that matter. (there are two on an MD2) I did say almost any gasket or seal.
I specifically mentioned the sump drain plug because they have an aluminium washer which corrodes away if any salt water gets on it leaving a rather loosely fitting plug. Common practice with these engines (and many others of course) is to pump the oil out via the dipstick/coarse strainer hole and never go near the drain plug. Almost impossible to get to it in some boats anyway!
from the rocker cover? Can you buy that?
[/ QUOTE ] Yes, either of them for that matter. (there are two on an MD2) I did say almost any gasket or seal.
I specifically mentioned the sump drain plug because they have an aluminium washer which corrodes away if any salt water gets on it leaving a rather loosely fitting plug. Common practice with these engines (and many others of course) is to pump the oil out via the dipstick/coarse strainer hole and never go near the drain plug. Almost impossible to get to it in some boats anyway!
Searush
Well-Known Member
[ QUOTE ]
[ QUOTE ]
In some engines, the oil is thrown about by the flywheel and escapes though the dry seal on the flywheel housing
[/ QUOTE ] But not in the case of the MD2b where the flywheel is at the front of the engine and fully exposed!
BTW the W/S manual is available HERE
[/ QUOTE ]
Vic, at the back of the MD2B there is another large toothed "flywheelly bit" which operates the tachometer magnetically. This sits in oil, & sprays it everywhere.
How do I know this? Simple, my tacho failed so I removed the sender from the top of the engine casing. Later, when using the engine for some hours during a trip to the IoM it seized. All the oil had been sprayed out of the sender hole into the bilge. Doh! /forums/images/graemlins/frown.gif
[ QUOTE ]
In some engines, the oil is thrown about by the flywheel and escapes though the dry seal on the flywheel housing
[/ QUOTE ] But not in the case of the MD2b where the flywheel is at the front of the engine and fully exposed!
BTW the W/S manual is available HERE
[/ QUOTE ]
Vic, at the back of the MD2B there is another large toothed "flywheelly bit" which operates the tachometer magnetically. This sits in oil, & sprays it everywhere.
How do I know this? Simple, my tacho failed so I removed the sender from the top of the engine casing. Later, when using the engine for some hours during a trip to the IoM it seized. All the oil had been sprayed out of the sender hole into the bilge. Doh! /forums/images/graemlins/frown.gif
[448]
...
Other potential source of oil leaks are the 2 pressed tin side plates lurking under the exhaust manifold. Prone to corrode through as well as leak at the gasket.
Searush, I don't recognise this toothy bit on my MD2B.
Cheers, Dave
Searush, I don't recognise this toothy bit on my MD2B.
Cheers, Dave
VicS
Well-Known Member
[ QUOTE ]
Searush, I don't recognise this toothy bit on my MD2B.
[/ QUOTE ] There are a number of "toothy bits" that make up the drive from the back end of the crank shaft to the camshaft, governor and injection pump and also the hand start gear. They are all out of sight though. I think the "toothy bit" that the rev counter sensor takes its impulses from is actually one that is part of the hand starting gear.
Quite obvious that if you remove the sensor that it'll chuck oil out of the hole, Searush realises that now!
The engine side-plates are as you say yet another possible source of an oil leak. Not so sure about them corroding. On the MD11 they are stainless I think, but don't know about the md2 but I would have assumed they were as well.
Searush, I don't recognise this toothy bit on my MD2B.
[/ QUOTE ] There are a number of "toothy bits" that make up the drive from the back end of the crank shaft to the camshaft, governor and injection pump and also the hand start gear. They are all out of sight though. I think the "toothy bit" that the rev counter sensor takes its impulses from is actually one that is part of the hand starting gear.
Quite obvious that if you remove the sensor that it'll chuck oil out of the hole, Searush realises that now!
The engine side-plates are as you say yet another possible source of an oil leak. Not so sure about them corroding. On the MD11 they are stainless I think, but don't know about the md2 but I would have assumed they were as well.
Bilgediver
Well-Known Member
Searush, I don't recognise this toothy bit on my MD2B
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Oh you must do......its not a flywheel....its the camshaft drive gear and yes if you remove a fitting on the crankcase of a small engine then of course all the oil will come out....
Oh by the way....don t be a dipstick and check the oil level of an MD2 or similar when the engine is running as the dipstick/strainer is in the oil pump suction line so with all that air being soooked in the pump will have problems lubricating the bearings and you ll soon be knocking on Mr Beta's door.
***********************************************
Oh you must do......its not a flywheel....its the camshaft drive gear and yes if you remove a fitting on the crankcase of a small engine then of course all the oil will come out....
Oh by the way....don t be a dipstick and check the oil level of an MD2 or similar when the engine is running as the dipstick/strainer is in the oil pump suction line so with all that air being soooked in the pump will have problems lubricating the bearings and you ll soon be knocking on Mr Beta's door.
Searush
Well-Known Member
Whoops sorry, old memories not in gear tonight - yes it was at the back of the hand start drive - and it wasn't as big as my post implied. It all happened a long time ago (at leats 10 years) - engine was rebuilt & died again some years later - finally replaced 2 years ago.
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