Two daft questions.

[Mike k]

1. I have 2 fanbelts connecting alternatior, water pump and they just run parallel- is this just a safety feature if one breaks?

2. I read on here someone manually turning their engine off down in the engine bay- how do you do that?

Thanks

Mike

 

[BruceK]

1-pass
2- on my KADs there is a small lever on the fuel pump. Pull it up and the engine cuts.

 

[stelican]

To prevent slippage when alternator is under heavy load

 

[Lon nan Gruagach]

The most efficient belt is a wide, thin one. 2 side by side are a step in that direction as opposed to a single one with twice the cross sectional area.
It's all to do with the work needed to flex the belt as it enters and leaves a pulley.

 

[jrudge]

2. I read on here someone manually turning their engine off down in the engine bay- how do you do that?



Mike

Volvo D12 - a big red button .

I seem to remember on my Cats it was a black button

If the engine is electronic it will be a switch of some sort.

 

[Portofino]

MAN electronic there’s a big red button on the ECU box
View attachment 70943

For some reason a pair of stop buttons above the keys on the dash too - they work too .
View attachment 70944

We also have remote fuel shut off valves near the helm ( sorry no pics ) as part of the fire ex kit .

There’s some breakers in the saloon panal for the engine ECU s as well .

 

[Mike k]

Thanks very much for the replies. I now understand the 2 belt reasoning but I guess if one does shred underway the other should get me back ok?
On the engine cut off I have checked all my manuals and there is no button or pull thing on the delivery pump. Its an EDI system on a mercuriser 4.2 D tronic so I am guessing there is no manual intervention possible here.Damn!

 

[[2068]]

Service manual says:

"ENGINE SHUT OFF The principle of auto-ignition as applied to the diesel engine means that the engine can only be switched off by interrupting its supply of fuel. When equipped with Electronic Diesel Injection control, the engine is switched OFF by the Fuel Quantity Actuator (an input signal from the ECM: injected fuel quantity = zero). The Fuel Shut Off Valve, a separate electrical engine shut off device on the fuel pump, serves as a standby shut off in case the actuator should fail."

i.e. there is no manual way to stop the engine, other than turning off the fuel supply or stuffing something into the air intake.

Also, although one belt will work fine on it's own, I've had one belt shredding and taking out the second one as it failed.
So keep them in good conditioned and properly tensioned.

.

 

[Mike k]

Service manual says:

"ENGINE SHUT OFF The principle of auto-ignition as applied to the diesel engine means that the engine can only be switched off by interrupting its supply of fuel. When equipped with Electronic Diesel Injection control, the engine is switched OFF by the Fuel Quantity Actuator (an input signal from the ECM: injected fuel quantity = zero). The Fuel Shut Off Valve, a separate electrical engine shut off device on the fuel pump, serves as a standby shut off in case the actuator should fail."

i.e. there is no manual way to stop the engine, other than turning off the fuel supply or stuffing something into the air intake.

Also, although one belt will work fine on it's own, I've had one belt shredding and taking out the second one as it failed.
So keep them in good conditioned and properly tensioned.

.

Thanks FP you have reassured me that I concluded the same regarding the engine shut down. The belt is always a nagging concern because to change them I have to take off the sea water inlet hose to the pump and its a bit awkward. Good advice thanks.