Jump to content

BMC 1.5 No Drive!

Rob1234

By Rob1234
in BMC

 Share

Featured Posts

RLWP Veteran II

RLWP

Posted
Posted

Thanks Richard for help uploading pics. The gearbox isn't sitting in water, so I guess it must be the cooler. Maybe start with a good clean with diesel, should oil be pumped out of the pipes when not connected?

 

It may not be sitting in water now, that doesn't mean it wasn't in the past

 

Richard

Link to comment
Share on other sites
gazza Veteran

gazza

Posted
Posted (edited)

Those oil cooler hoses look ripe for changing too....

 

Try a local Hydraulic firm, they will be cheap as chips to replace.

 

Is your engine raw water cooled?

 

If keel cooled are you suffering from coolant loss?

Edited by gazza
Link to comment
Share on other sites
RLWP Veteran II

RLWP

Posted
Posted

What you need to do is pressure test the cooler. You have three options:

 

Disconnect the oil hoses and run the engine, when it is hot, the pressure in the cooling system will force water out the oil side of the cooler

 

Disconnect the water hoses and run the engine. The oil pressure in the box will push oil out of the water side of the cooler

 

Just buy a cooler

 

Richard

Link to comment
Share on other sites
gazza Veteran

gazza

Posted
Posted

What you need to do is pressure test the cooler. You have three options:

 

Disconnect the oil hoses and run the engine, when it is hot, the pressure in the cooling system will force water out the oil side of the cooler

 

Disconnect the water hoses and run the engine. The oil pressure in the box will push oil out of the water side of the cooler

 

Just buy a cooler

 

Richard

 

 

My thoughts exactly!

 

In the workshop I've got an old bowman heat exchanger that has a leaking tube stack - its no use to man nor beast at the moment - well not if you want raw water cooling as I do!

It was a freebie so I shouldnt have expected too much.

 

Tube stacks are an eye watering price, I have neither the time nor inclnation to rebuild the original so on the shelf it must stay until a decent secondhand replacement turns up

Link to comment
Share on other sites
gazza Veteran

gazza

Posted
Posted

I draws water from the canal and spits it out the exhaust! Is that Raw water cooled?

 

It has a heat exchanger ( which was empty the other day) but since top up, stayed full.

As Richard has said, time for a new gearbox oil cooler. The tubestack is leaking cooling water into your gearbox oil.

Link to comment
Share on other sites
RLWP Veteran II

RLWP

Posted
Posted

I draws water from the canal and spits it out the exhaust! Is that Raw water cooled?

It has a heat exchanger ( which was empty the other day) but since top up, stayed full.

 

Many BMCs were set up with two cooling circuits. There is a circuit running through the block and head, and into a large header tank with a heat exchanger in it. You must keep this circuit topped up or you'll blow the head gasket. Flowing through the heat exchanger is canal water sucked from a sea cock, through a pump, through the heat exchanger, possibly around the exhaust manifold and then out of the exhaust. The gearbox cooler is probably in this circuit too

 

Richard

Link to comment
Share on other sites
RLWP Veteran II

RLWP

Posted
Posted

My old boat had raw water pumped through the block by a jabsco pump on the cam shaft, back in the days of the 105E petrol engine. Two of them, they never both started simply.

 

I'm not sure which I prefer. A skin tank is a closed system with corrosion protection in the water. A straight raw water system like that is simple and carries the least components

 

The indirect raw water system is about as complicated as it gets!

 

Richard

Link to comment
Share on other sites
David Mack Veteran II

David MackDonate to Canal World

Posted
Posted

 

I'm not sure which I prefer. A skin tank is a closed system with corrosion protection in the water. A straight raw water system like that is simple and carries the least components

 

The indirect raw water system is about as complicated as it gets!

 

Richard

 

 

Which is fine in an engine designed for it, but a lightweight engine designed for vehicle use includes components which are not sufficiently corrosion-resistant for use with constantly refreshed oxygenated water - especially salt water. I once had a direct cooled BMC 1.5 in which one of the core plugs rusted through, resulting in a spurt of water which happened to land on the dipstick, where it all ran down and turned the oil into latte!

 

 

vehciel

Link to comment
Share on other sites
Rob1234 Explorer

Rob1234

Posted
  • Author
Posted

Just spoke to them, they can match up the hoses if I bring the old ones in. Probably wouldn't have a oil cooler on the shelf, although he said he has one...about a foot long and 5" in diameter! Sounds possible!

Link to comment
Share on other sites
Rob1234 Explorer

Rob1234

Posted
  • Author
Posted

I looped the oil pipe back into the gearbox as a member recommend, run it with some diesel in and drained. Popped some oil in and still no drive? Ran out of ideas and daylight so will look again in the morning!

Link to comment
Share on other sites
RLWP Veteran II

RLWP

Posted
Posted

From memory, yes. Without checking the book, I think the pump puts oil through the cooler before the internals of the box

 

Not that it matters, oil should be coming out anyway

 

Sound like your pump has failed

 

Richard

Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
 Share
Go to topic listing

  • Recently Browsing   0 members

    • No registered users viewing this page.
×
×
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.