|
| Md3b overheated when exhaust/saltwate... |
| Author |
Message |
    
Monty Benton
Visitor
| | Posted on Friday, September 19, 2014 - 03:40 pm: | 
|
Saltwater/ exhaust pipe fell off during maiden voyage of used boat. Lots of smoke in engine room and no water coming out through hole tipped me off. Was able to get good anchorage. Reattached exaust hose. Next morning breifly the engine fired and ran long enough for me to get anchor up but then it died and we drifted close to shore before anchor caught again, bled fuel filters of air to see if that would help and checked raw water filter and fuel filter which are both clean. Cannot find any other problems with my limited knowledge of diesel inboards. Just replaced battery and engine cranks fine but has refused to fire since giving out that morning. Luckily we were saved by a passing friend with a boat less than a third the size with an 8 horse Yamaha on the back. Didn't think he could budge our 34 foot 30 tonne ferro cement cutter with his 23 foot fiberglass Grampian but he towed us 2.5 km to our other friends dock. Any ideas? We are trapped here until we figure this out |
Monty benton
Visitor
| | Posted on Friday, September 19, 2014 - 04:41 pm: |
|
Volvo penta 36 hp 3 cylinder by the way |
eric
Senior Member
Username: eric
Post Number: 51
Registered: 03-2006
| | Posted on Saturday, September 20, 2014 - 06:44 am: |
|
Tricky one as Volvo engines can be quite temperamental, Just above the fuel pump there should be a bleed screw, loosen that to make sure fuel is getting to the pump, (if fitted, use the primer pump to check this) on some MD engines there is no fuel pump primer and relies on gravity feed to the engine from the tank.(I had to fit an electric pump as the tank was lower)
By doing this it may displace any air locks in the system as this is a major problem with Volvo's. Your exhaust falling off should not have affected the general operation of the engine. If you have an oil pressure gauge fitted ensure you have oil pressure even on start revs, it will not give max pressure but should give you a reading. These are the two main factors that will effect the starting of your engine. I know many will say otherwise but sometimes a very small spray of Easystart into the air filters will kick it into life especially if it is an old engine ie; 1970/80.. Hope this helps |
eric
Senior Member
Username: eric
Post Number: 52
Registered: 03-2006
| | Posted on Saturday, September 20, 2014 - 06:55 am: |
|
One other thing, just by bleeding the fuel filters doesn't necessarily follow that the fuel pump itself is primed as there could be an air lock between the filter and pump. Volvo pumps don't like air and are not capable of priming them selves up. You said that there was no raw water coming out of the pipe??? Check also your water pump impeller and ensure plenty of water is coming out with your exhaust. Check also your dipstick (oil) ensure it is nice and black or looking like oil if it has been recently changed. If it is MILKY then there is water getting into your oil and that could be one of your head gaskets which has blown. |
matt_morehouse
Senior Member
Username: matt_morehouse
Post Number: 138
Registered: 12-2009
| | Posted on Saturday, September 20, 2014 - 10:11 am: |
|
Have you used the compression releases?
Loosen a return fuel fuel line, turn the engine and see if fuel comes out without air bubbles. If it does you know that cylinder is getting proper fuel.
I used to squirt some engine oil into the cylinders to increase the compression. This is a lot less disruptive than using starting fluid, though I often used that.
An electric fuel pump is a very good thing, no more bleeding the lines. I used an el cheapo 12vdc auto pump. |
|
|
|
|
