volvo MD7A

[jouet 820]

Originally Posted by delmag

were you able to re-use the gaskets??? or, did you have to buy new ones?

I reused the gaskets.the manifold was blocked solid cleaned it out now 100%

[delmag]

sweet!. glad to confirm that it's possible and that you were successful.

[hpeer]

I too have Volvo MD7A with salt water cooling and a heating problem. The boat is quite far, far away from both me and parts sources so I need to figure out what I have to buy to bring with me to fix her.

The engine runs perfectly with one exception, it occasionally overheats and I can't figure out what the heck is going on. I bought the boat used and the previous owner had fitter her out himself. Every time she overheats, I find something to "fix" after which she is fine for a spell then she will overheat again. Clearly I'm not getting to the root cause. Generally she will seem to be running along just fine and all of a sudden the pressure gauge just goes up, up, up. It seems to be a bi-state kind of thing, it either works perfectly well or not at all. Its almost as if there is a ball valve or something somewhere that is sticking. It's obviously not a bad gage.

The plumbing goes like this:
Through hull fitting
Salt water strainer
Tap to the transmission/engine
Tap to secondary pick up from bilge
Tap to sinks


Here is some of the history and what I had done, in each case I have also checked/changed the impeller. They usually look just perfect.

1: Recently fitted salt water strainer seemed to be blocked with debris from its construction. It is home built out of some interlocking pieces of PVC pipe, the inner piece has a zillion small holes drilled in it. I dumped this stuff out and she was fine.

2: Found a small leak in the copper pipe from the transmission to the impeller. I thought that maybe it was sucking in air and the impeller was getting air bound. Repaired the leak.

3: Moved and lowered the salt water strainer. This was mounted pretty high on a bulkhead with real long hoses. I moved it to the engine compartment and lowered it. I thought that maybe there was just too much suction head to get the water going.

4: Threw thermostat overboard.

Any clues?

Many thanks,

Howard

[jouet 820]

The problem could be a partly blocked manifold it's a easy job to remove and clean out,you don't need any special tools i used the same gaskets just put instant gasket on them . this increased the water flow by 100%.

[aries2006]

Looking for perkins 2306 CE 14TAG-3 Engines parts manual,Any body here to help please