Interesting problem with starter / solenoid Perkins 4-107

[Refueler]

A squeezy bulb like outboards have would enable you to prime your fuel system

I know I can wait till I get back on boat and measure the pipe ... but just wondering what size bulb pump ... 6mm connector ?

I know one thing that stopped me before - the lines are solid all way from tank to engine bay and difficult to find place to have hand pump. .... think I'll have to open up a few areas and see where to fit.

Second ... where is best ... probably at tank area is easiest - but would think that best for action is near engine filter ...

 

[Refueler]

Full charged battery ... bit of jungle juice in intake ... VROOM !!

Few seconds rough as she cleared herself and got fuel through ... then sweet as ever ...

Very pleased ... AND sorted the domestic -ve return ...

 

[Refueler]

Just thought I'd show ....




That's at just over idle ... I know they say to close in the sea valve to control water volume ... but I'm happy to know that plenty water is getting through ..

Before some one tells me - yes I know my teak rubbing strake is coming away. In fact it needs replacing entire surround.

 

[RichardS]

That's at just over idle ... I know they say to close in the sea valve to control water volume ... but I'm happy to know that plenty water is getting through ..

Great news about the starter motor but I can honestly say that I've never heard anyone suggest that the sea water intake should ever be deliberately reduced.

As most engines usually have a thermostat controlling the temperature of the coolant in the cylinder water jacket, I would be interested to know why one would ever want to reduce the sea water intake?

Richard

 

[Refueler]

Great news about the starter motor but I can honestly say that I've never heard anyone suggest that the sea water intake should ever be deliberately reduced.

As most engines usually have a thermostat controlling the temperature of the coolant in the cylinder water jacket, I would be interested to know why one would ever want to reduce the sea water intake?

Richard

You don't have a Perkins Manual then ? They talk about it with raw water cooling - which I have. Imagine a thermostat with raw cold water ..... I don't have a thermostat for that reason. On later engines - a relief valve was fitted so a thermostat could be used with raw water systems to allow water pressure to be relieved when thermostat closed. Page M1 of the manual.

I'm quite happy to have my 'blaster' as then I know I am not getting engine hot enough to start depositing salt etc. in the waterways ..

 

[RichardS]

You don't have a Perkins Manual then ? They talk about it with raw water cooling - which I have. Imagine a thermostat with raw cold water ..... I don't have a thermostat for that reason. On later engines - a relief valve was fitted so a thermostat could be used with raw water systems to allow water pressure to be relieved when thermostat closed. Page M1 of the manual.

I'm quite happy to have my 'blaster' as then I know I am not getting engine hot enough to start depositing salt etc. in the waterways ..

That's interesting. I know absolutely nothing about raw water cooled engines without a thermostat. Indeed, I've never even heard of such a thing.

I guess that they must be rather unusual these days as I've never read the flow restriction technique on these forums since I joined but I can fully understand why, without a thermostat, over-cooling becomes a concern.

Richard

 

[Refueler]

Many early engines were raw water cooled and no thermostat because the coolant never reaches opening temperature. Its not like closed 'loop' heat exchanger system.

As Perkins say - with raw water cooling - do not run engine hot as closed system - to avoid depositing salts in the waterways and restricting flow. But they talk about using the sea valve to control flow.

Heat exchanger - closed system of course is a different game altogether as the thermostat is then 'controlling' the engine temp at optimum, with no risk of blocking waterways.

Later engines then came up with pressure relief valve systems to allow thermostats on raw water cooling. To be honest - not something I would like, fit too hot a thermostat and over time you could cause restricted waterways. At least with my 'over-cooled' system - I have no fears of that. I know I am not getting best temperature for fuel use - but I'd rather use a slight more fuel than have to clean out waterways ....

I have considered converting to closed system ... means adding a belt driven pump and re-route water pipes ... but at end of day .. my engine has run sweet for decades like this ...

 

[Refueler]

Here's the page from the Perkins 4 series book ....