Ray Posted March 12, 2022 Share Posted March 12, 2022 I realise this is a common topic! After a gentle cruise from Potter to St Benets this week there was only just enough hot water for 3 of us to wash our hands for a picnic lunch. This doesn't seem right to me. I won't be able to go to the boat again until next week but are there any specific things I should look at first. Broom 29 with shore power but no immersion heater and no inverter. Thanks in advance for any tips. Quote Link to comment Share on other sites More sharing options...
Smoggy Posted March 12, 2022 Share Posted March 12, 2022 Air lock in the coolant/calorifer hoses I suspect, I assume it was fine before and the engine got up to temp ok. 1 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 12, 2022 Author Share Posted March 12, 2022 11 minutes ago, Smoggy said: Air lock in the coolant/calorifer hoses I suspect, I assume it was fine before and the engine got up to temp ok. The engine temp was "probably" OK but I also have an electric/instrument issue and half way back I noticed the temp gauge was not registering! Edit to add, temp guage has always been OK and is not part of the instrument issue I have up til now. So in fact it's possible the engine did not get up to temp! Quote Link to comment Share on other sites More sharing options...
WherryNice Posted March 12, 2022 Share Posted March 12, 2022 Did the temp gauge move at all? It sounds like an engine thermostat issue to me... 1 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 12, 2022 Author Share Posted March 12, 2022 I would need to double check, but it was not registering even to the first mark on the dial! Quote Link to comment Share on other sites More sharing options...
Smoggy Posted March 12, 2022 Share Posted March 12, 2022 Whip the thermostat out and suspend it in a cup of boiling water the see if it opens and closes ok, it should be closed untill hot. 1 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 12, 2022 Author Share Posted March 12, 2022 Thanks, I'll make that the first thing I do. Itching to get there and sort it out but can't get there until next week as we have family visiting! Quote Link to comment Share on other sites More sharing options...
annv Posted March 12, 2022 Share Posted March 12, 2022 Hi Ray assuming that you have checked for water leaks with pump turned on release the pressure valve on top of calorifiera by twisting the ****, water should come out if this is so start engine after a few minitits feel the hose that runs from rear of engine to calorifera if warm then feel top hose that goes to heat exchanger this should be cold if not, also warm your engine thermostat needs replacing. John 1 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 12, 2022 Author Share Posted March 12, 2022 Thank you John 👍 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 12, 2022 Author Share Posted March 12, 2022 Just looking at thermostats in case I need to buy one. Peachments for example list about 30 for Nanni engines and all I know is the paperwork says it has a Nanni 50. How would I identify the one I need if it does need replacing? Quote Link to comment Share on other sites More sharing options...
Mouldy Posted March 12, 2022 Share Posted March 12, 2022 22 minutes ago, Ray said: Just looking at thermostats in case I need to buy one. Peachments for example list about 30 for Nanni engines and all I know is the paperwork says it has a Nanni 50. How would I identify the one I need if it does need replacing? Takeit to Peachments and ask for a replacement. Sorry Ray, that sounds sarcastic, but it’s not meant to be. It’s what I’d do. 1 Quote Link to comment Share on other sites More sharing options...
OldBerkshireBoy Posted March 12, 2022 Share Posted March 12, 2022 40 minutes ago, Ray said: Just looking at thermostats in case I need to buy one. Peachments for example list about 30 for Nanni engines and all I know is the paperwork says it has a Nanni 50. How would I identify the one I need if it does need replacing? Part number stamped on it somewhere perhaps? 1 Quote Link to comment Share on other sites More sharing options...
WherryNice Posted March 12, 2022 Share Posted March 12, 2022 47 minutes ago, Ray said: Just looking at thermostats in case I need to buy one. Peachments for example list about 30 for Nanni engines and all I know is the paperwork says it has a Nanni 50. How would I identify the one I need if it does need replacing? Hopefully there will be an engine number and/or engine code on the engine somewhere(sorry I'm not familiar with Nanni engines) which should tell Peachments what they need to give you the correct one(I would think). If in doubt give them any numbers you can find or even take a picture of the engine to show them. 1 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 12, 2022 Author Share Posted March 12, 2022 All good ideas, many thanks guys 👍 Quote Link to comment Share on other sites More sharing options...
Vaughan Posted March 12, 2022 Share Posted March 12, 2022 11 minutes ago, WherryNice said: Hopefully there will be an engine number and/or engine code on the engine somewhere Normally it is a tin plate on top of the bell housing. 1 1 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 12, 2022 Author Share Posted March 12, 2022 Thanks Vaughan 👍 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 15, 2022 Author Share Posted March 15, 2022 Thermostat and gasket being sent to me by Peachments (very helpful by the way) It's a while since I worked on engines in any capacity, what are your opinions on applying liquid/silicone gasket in addition to the standard one supplied please? Quote Link to comment Share on other sites More sharing options...
Smoggy Posted March 15, 2022 Share Posted March 15, 2022 Depends on the type of gasket, rubber shouldn't need anything, cork just needs a bit of grease, setting silicon is the work of satan and should be banished as it will just leave bits of stringy silicon inside the cooling system waiting to block something. Whatever you use do it as thinly as possible, a new gasket on a clean face shouldn't need anything but a smear of grease makes then easier to repair and reuse on the go in the middle of nowhere. 2 1 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 15, 2022 Author Share Posted March 15, 2022 Thank you... it's much more satisfying to learn how to do jobs and accomplish maintenance for myself. You guys are very kind and helpful 🍺 Quote Link to comment Share on other sites More sharing options...
annv Posted March 16, 2022 Share Posted March 16, 2022 Hi Ray Silicon is usefully used in place of a gasket. often aluminium castings use silicon in place of a gasket, quicker and cheaper on a assembly line, thermostat housings use a rubber ring, cork gasket or thick paper gaskets, this is because of the possible movement as temp goes up and down on housing, often a smear of grease or hylomer or red hermotite is used if casting surface has corroded and pitied though time or housing may have warped, all should be used sparingly and surplus wiped from edge after tighting and only tighten wrist tight. John 1 1 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 16, 2022 Author Share Posted March 16, 2022 Thank you John 👍 Quote Link to comment Share on other sites More sharing options...
dnks34 Posted March 16, 2022 Share Posted March 16, 2022 If the thermostat is housed inside the actual heat exchanger itself (as it was on my nanni 50hp) be very careful removing the bolts. I forget if there were 4 or 6 but each one sheered and the complete heat exchanger had to come off for repair. Luckily it was coming off anyway as it was cracked. Hopefully you wont have the same trouble. 1 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 16, 2022 Author Share Posted March 16, 2022 9 minutes ago, dnks34 said: If the thermostat is housed inside the actual heat exchanger itself (as it was on my nanni 50hp) be very careful removing the bolts. I forget if there were 4 or 6 but each one sheered and the complete heat exchanger had to come off for repair. Luckily it was coming off anyway as it was cracked. Hopefully you wont have the same trouble. Thanks for the warning, I'll definitely proceed with caution! Quote Link to comment Share on other sites More sharing options...
OldBerkshireBoy Posted March 16, 2022 Share Posted March 16, 2022 Just saying that not any old silicon that you may have laying around are safe to use when potable water is involved ie fresh water pumps. 1 Quote Link to comment Share on other sites More sharing options...
Ray Posted March 18, 2022 Author Share Posted March 18, 2022 On 16/03/2022 at 12:52, dnks34 said: If the thermostat is housed inside the actual heat exchanger itself (as it was on my nanni 50hp) be very careful removing the bolts. I forget if there were 4 or 6 but each one sheered and the complete heat exchanger had to come off for repair. Luckily it was coming off anyway as it was cracked. Hopefully you wont have the same trouble. The housing is next to the heat exchanger on mine and the 4 bolts are nicely accessible. I remembered what you said though and proceeded with as much caution as I could, which wasn't much I guess.... 3 of them sheered off! At least I knew from your post that it could happen so I didn't tear my hair out lol The lovely people at Sutton Staithe Boatyard are coming next week to fix it for me. I know I could attempt this as a DIY job but it's always best I think to know my limitations and not risk making a bad job worse 👍 Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.