Volvo temp

Seastoke

Seastoke

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So on one of our legs from the Welsh med to the sarf, one engine went from 85 c upto 90 c I dropped the revs then back up and the temp fell to 85 strait away then all was fine for the rest of the trip , it has done it twice now in over 3 hundred miles, any clues.
 
Brixham Bound said:
So on one of our legs from the Welsh med to the sarf, one engine went from 85 c upto 90 c I dropped the revs then back up and the temp fell to 85 strait away then all was fine for the rest of the trip , it has done it twice now in over 3 hundred miles, any clues.
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Possibly that water down sarf is a ‘tad warmer than where you started??
 
So it happened again today , it’s weird as if I drop say 200 revs the gauge will drop strait away back to 85 , not slowly normally temp goes slowly surely.
 
Seastoke said:
But it doesn’t kept going up
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When I had my Volvo penta d4 engined boat, if the heat exchanger was blocked it would run at normal temperature (80deg I think)all day long aslong as the revs were kept under 3000rpm, as soon as you went over 3000rpm the temp would climb quite quickly to 90deg, then just sit there at 90 Deg. Drop the revs back down and the temp would quickly drop back to 80 Deg. When the heat exchangers were cleaned out at the end of the season it would sit at 80 Deg at all revs.
 
Seastoke said:
Did you do a Rydlem flush
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No I didn't, well not me directly, I just asked the bloke that serviced the engines to clean the various heat exchangers as part of the service that season ( needed doing every 3 or 4 years) and he did. I've no idea how he did it, but it wasn't cheap, added about 1000 euros to the usual bill
 
90 is considered within tolerance, on a number of diesel engines in use. Have you checked the manual for the acceptable figures ?
 
QBhoy said:
90 is considered within tolerance, on a number of diesel engines in use. Have you checked the manual for the acceptable figures ?
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Agree, 90 degrees is not a problem. Coolant under 10psi pressure will not boil until at least 120 C (or higher depending on the concentration/quality of the coolant and the pressure rating of the cap)

www.solocoastalsailing.co.uk
 
Plum said:
Agree, 90 degrees is not a problem. Coolant under 10psi pressure will not boil until at least 120 C (or higher depending on the concentration/quality of the coolant and the pressure rating of the cap)

www.solocoastalsailing.co.uk
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agree that 90 is not a problem in the absolute sense, but it is indicative of something starting to go wrong/an abnormality , if the engine normally/used to sit at 85 under all conditions (inc at wot).
 
How new are the impellers? Are they OEM as well ?
Thinking it’s a impeller bit that’s detached earlier on the long trip down now temporarily now and again blocking a certain % of the stack holes .Or just fast stuck reducing cooling capacity.That fits .

End cap off to examine.
 
what engine is it seastoke?

if VP D series, then the temp sensor isnt an old style analogue resistance driven gauge, its a digital gauge (well the gauge itself can be an analogue style one or digital style, but they are digitally driven by the ecu rather than resistance based) which means that when the actual engine temp is in the normal range the gauge shows 85 deg regardless of what the temp actually is - as long as its within the normal range (lets say 82-87 for purposes of this discussions, but I dont know the actual range) - as soon as it goes out of the normal range then the gauge shows the true temp, hence the rapid swings in temperature as displayed on the gauge.

if it is a vp D series, my money is on your heatexchanger/coolers starting to become blocked up, when were they last cleaned?
 
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