Misleading boat details

Re: Thank you

Thats it Chuns...fast'ish idle gets the combustions chambers hot.....burns off the fuel efficiently,prevents unburnt diesel deposits in the exhaust and most important of all a healthy circulation of oil through those important parts like main, big end and camshaft bearings.



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Re: Waxstat

> Just try searching 'diesel waxstat'

Just tried this, a few non marine matches showed up plus a punchy debate on a yachting forum.

> I would be surprised if small marine diesels would be fitted

Looks like I will have to set a fast idle myself.

> Having said that Volvo are quality engine builders

This is encouraging though it was Bavaria's choice.

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Re: Mech inspection

Try 'thermostat' the bit in the middle is a waxstat, as the temp increases so does the wax, thus opening the thermostst and allowing cooling water to flow.
Not sure if this is the answer you want, but that's a waxstat.

Brian

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Re: Mech inspection

Err no, I think Waverider was talking about a device that mandates a fast idle until a minimum temperature is reached. On further research is seems typical small yacht engines are not fitted with these.

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Re: Mech inspection

No problem, just pointing out the bit in the middle is the waxstat, in your case it holds the throttle open a small amount, as the engine comes up to temp it expands, and closes the throttle.


Brian

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Re: Mech inspection

>Err no, I think Waverider was talking about a device that mandates a fast idle until a minimum temperature is reached. On further research is seems typical small yacht engines are not fitted with these.

Well Jonjo halcyon has hit the nail on the head really....as people would naturally assume a waxstat is only connected with thermostats in the cooling system, a similar use of this device is also used to operate fast idle on diesels and petrol engines too! i.e as halcyon as already explained that when the wax expands it cuases the thermostat to open.

When a wax device is used to control warm up it would have a rod that moves out of it's body to cancel a cam connected to the throttle linkage when the coolant had reached a certain temperature. This device has been used widely by many different manufacturers including good old Ford!

As for small yacht engines it would appear that they are always about 20 years behind in modern technology, which probably could be that they use either old refurbished engines that were once used on the road, Or a manufacturer decides to use old castings and tooling from a well proven design and make it into a marine engine (makes sense really!) !. Please correct me if I am wrong but I was lead to believe that Yanmar engines were never originally designed for yachts but for Paddy Field Pumps!

As I have just mentioned Jonjo most engines today are modified for marine use with the exception a few companys such as Volvo Penta which from this part of the Volvo empire specialise in designing and building marine and fork lift engines.

Hence why I complimented you on your choice of engine for your own boat, I like the 3cyl diesels as they run so smooth without all that banging and thumping you would normally get from a single or a twin. A friend of mine had a Perkins 3cyl in his boat (normally fitted to a Massey Ferguson 135 tractor!) and that ran really sweet too!







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Re: Something definative?

> it would seem that a few people here are upset of what I have posted

I think that most posters here want to treat their diesel engines kindly and believe that after starting it is nessary to compromise between leaving the engine at idle to warm up and the theory that damage occurs when a diesel engine is left to idle without load for too long.

I did not advocate starting a cold engine and then immediately motoring off at 2500 rpm. Unlike you I was prepared to post my typical start up procedure that included 3 minutes of idling. You skipper a typical yacht, so could you post your recommended engine start-up procedure including PRM and duration because the difference between operating temperature and running temperature is lost on most people I suspect.

Or how about the following hypothetical case.

An indirect cooled diesel engine, < 2000 hours, with 2 or 3 cylinders, between 15hp and 25hp mounted in a 4 to 7 ton yacht, that has an initial temperature of 7 degrees C and where local regulations require that the yacht must not exceed 4 knots in the first 1/2 mile after leaving a marina.

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