Nanni Diesel Water Temp

[craigmc67]

Just fixed the water temperature gauge on my broom robb, it has a nanni 4 150 he.

the water temperature gauge is running at approximately 90 degrees c and at points it a bit higher dose that sound about right or a bit hot ?

[BrundallNavy]

A bit hot I would say. 

[Vaughan]

The 4150 is an early engine, which conformed to Italian horsepower limits on hire craft.  Does it have the word KUBOTA pressed into the top of the rocker box?

They do run fairly hot - but 90 is a bit high.  They depend on a pressurised water system, so check that the pressure cap is in good order.  Also a good idea to take out the tube stack in the heat exchanger and check the tubes are not furred up.  A couple of days immersed in vinegar can make a big difference.  Obviously also check the condition of the raw water pump and ensure there is a good flow of water coming from the exhaust.  If there is a long delay when starting, before water comes out, then you have a pump problem.

Do NOT take off the water pressure cap when the engine has been running and is still warm. There is a lot of pressure in there!

[craigmc67]

Thanks I’m taking her for a little trip from Beccles to oulton broad so will check everything out

is the away to check the the actual water temperature say using a probe ?

[Vaughan]

15 minutes ago, craigmc67 said:

is the away to check the the actual water temperature say using a probe ?

In my experience, an electric water temp. gauge either shows the correct temperature, or it doesn't work at all.

In the early days of Crown Blue line we did have problems with overheating on the Nanni 4150 and 4190.  After research with Peachments, we fitted a larger Jabsco raw water pump.  If the problem persists, talk to Peachments as they are the Nanni agents and have a lot of experience of the problem.

Ask for Andrew Peachment and give him my kind regards!

[BrundallNavy]

You can cross check with a IR thermometer or as I have used a meat probe. 

[Smoggy]

With an IR thermometer don't point it at a shiny bit of engine or you'll get a duff reading, a nice matt black hose is the ideal spot to check, they are dirt cheap off fleabay.

[JanetAnne]

It may just be a slight mismatch between your Nanni sender and Durite gauge Craig.

Probably worth getting the sender parameters from Peachments and compare with the Durite input range. 

That engine didn't show any signs of having been too hot previously

[Smoggy]

A crappy connection somewhere with a bit of extra resistance would make a european gauge read higher, a USA gauge would read lower with the same issue, if you disconnect the sender the gauge will likely go to the very top.

[craigmc67]

Thanks I will call them Monday, I have used them before and always found them very helpful especially Brian in the technical department 

[craigmc67]

2 hours ago, JanetAnne said:

It may just be a slight mismatch between your Nanni sender and Durite gauge Craig.

Probably worth getting the sender parameters from Peachments and compare with the Durite input range. 

That engine didn't show any signs of having been too hot previously

We can check it out tomorrow Dave I will bring a temperature probe it doesn’t appear to be running hot