tid2021
New member
Hi I hope I'm in the right place for my question. I have a Volvopenta D1-30 and recently it started losing coolant. I have had;
1. The intercooler out, acid cleaned, pressure tested which can back all ok no defective tubes.
On testing the engine it still lost coolant?
2. I have disconnected and isolated the water heater.
On testing the engine I noted that when the reservoir cap is screwed on tight the level goes down but when the cap is left lose the liquid level remains the same. Also there is what appears to be a small amount of coolant (and maybe air) coming out of the what I would call the "breather" pipe from the top of the interchanger jacket. I ran the engine for 1hr at tickover and then for 1 hr at 2000rpm and everytime when tighening the cap the level goes down.
I read in one of the Volvopenta D1-30 manuals that the coolant is circulated under slight pressure, if the pressure gets too much there is a pressure relief system in the cap, could this be the problem?
My questions are
1. Has any other D1-30 owners had this problem? if so what was the solution?
2. Any suggestions why when the cap is tight the liquid goes down and when lose stays as is?
This is driving me round the bend, and of cause all the Volvo service people are busy
I am sorry if I am missing the obvious here.
Thanks and regards
1. The intercooler out, acid cleaned, pressure tested which can back all ok no defective tubes.
On testing the engine it still lost coolant?
2. I have disconnected and isolated the water heater.
On testing the engine I noted that when the reservoir cap is screwed on tight the level goes down but when the cap is left lose the liquid level remains the same. Also there is what appears to be a small amount of coolant (and maybe air) coming out of the what I would call the "breather" pipe from the top of the interchanger jacket. I ran the engine for 1hr at tickover and then for 1 hr at 2000rpm and everytime when tighening the cap the level goes down.
I read in one of the Volvopenta D1-30 manuals that the coolant is circulated under slight pressure, if the pressure gets too much there is a pressure relief system in the cap, could this be the problem?
My questions are
1. Has any other D1-30 owners had this problem? if so what was the solution?
2. Any suggestions why when the cap is tight the liquid goes down and when lose stays as is?
This is driving me round the bend, and of cause all the Volvo service people are busy
I am sorry if I am missing the obvious here.
Thanks and regards