Overheating Beta BD722 part 2

Habebty

Habebty

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Following on from my earlier post on the overheating problem and the excellent suggestions from other forumites, is anyone aware if Beta may have supplied some of the engines with heat exchangers that don't have enough tubes to pass enough cooling water through the unit, and if Beta have offered to change the fitted exchanger for an improved one?

I am not stating this as fact - only anecdotal hearsay.

just wondering
 
When the alarme on mine kept going off after revving a little higher than usual(no revcounter,sorry) I had the feeling the heath exchanger might be on the small side.I now have a new temp sender and the problem didn't reappear but I still think a bigger heath exchanger would solve a lot of problems.
 
My present boat is fitted with a B622, which engine later became the B722. When the previous owner was demonstrating the boat, he said words to the effect that the original heat exchanger was undersized and had been replaced. This was an engine dating from around 1993 however, which had been used for several years before being modified, so it wouldn't appear to have been desperately bad. I would have expected more recent engines to be fully sorted out.
 
dunno but last night I cleaned out the tubes on my volvo. they seemed clear right through but you ought to have seen the fizz when I put some dilute brick acid through them - and I'd swear the tubes were a good 25% bigger now that all the deposits have gone. thermal conductivity will be better too.

reason this was neceassary was that the idiot of a previous owner had been penny pinching by not using anti freeze and as a result had caused internal corrosion and deposit of crud (technical term). A further consequence was overheating at high revs. So it might be worth your cleaning out your tube bundles.

I doubt that Beta have underprovided but since heat exchangers only come in standard sizes it could be that the heat exchanger is marginal. Then any deterioration in the system (for example wear on the raw water ppump) could cause a problem.
 
Poor old marine engines....

Whatever the make, over the last 40 years the finger is often pointed at the design of the engine cooling package when the ownwer/skipper finally has to resort to shadow boxing.

Getting down to basics, engine cooling calculations are simple stuff. All manufacturers/marinisers have to take account of seawater ambients far far higher than those found around the UK. Any engine in our waters will have significant cooling system margin. If a cooler has been re-designed it my be to accomodate operation in a zone of high sea water temperature, it certainly will not have been done as a result of experience in U.K. operation.

Lack of systematic troubleshooting, for example tracing those last pieces of a failed impeller or zero heat exchanger maintainence as well as brainless installations can cause major hearache.

Another problem with small engines is that they are rarely subject to a proper installation review, basic shoolboy howlers as well as more complex 'designed in issues' can drive owners insane. I have come across examples ranging from simple incorrect antifreeze/coolant concentration in high seawater ambient applications to a super sexy looking polished stainless injection bend produced with pride in the builders fabrication shop causing excessive system back pressure.

Dodgy sensors, sensors re-located to the wrong place, single station and dual station sensors mixed up, a well known brand of waterlift muffler 'designed' to screw up maximum exhaust back pressure and maximum cooling water flow pressure, stern gland water take offs before cooling water has done its job..........

As to your original question the simple answer is no.
 
Could I suggest you try Jason Hatch on 01603 407394 / 07733 327474. He is a Beta man and if he knows he will tell you , if he doesnt know its not worth knowing !
 
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