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Old 30 August 2011, 03:09   #1
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Yanmar 315 or volvo D6 330 hp?

I currently have a Volvo penta KAD300 with dp-g leg in my Humber 9.5
I've had an incredible amount of problems with my engine, which even the dealers can't figure out.
startermotor turns but engine won't fire.
5 minutes later the engine fires but kills after releasing starterkey.
Then it won't start, and the supercharger clutch opens and closes when i push the stop button on the engine.
Sometimes when it starts, the rpm goes to 4000 in neutral and the gearbox switches itself into gear.
etc etc etc, all in different orders.
everything is replaced, from ECU to cable boom but nothing solves the problem.

Before i cerimonial burn the KAD300 in my back yard, i want to know wich engine is the best replacement: the spartan yanmar 315 with zt370 leg, or the D6 330hp?
Anyone with experience?
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Old 30 August 2011, 03:39   #2
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Yanmar is less complicated on the wiring side which makes it a more reliable bet
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Old 30 August 2011, 04:15   #3
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Yanmar's new 8LV 320 or 370hp is lighter than the old 6LP and twin turbo's for better pick up, supposed to be a really good motor. Looks their answer to the the Volvo D series
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Old 30 August 2011, 04:53   #4
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From what I hear, the Volvo is very nice but is very complicated - I'm told that they drop into "limp home" mode if they are not happy, and they're not happy quite often. If you have a Volvo dealer nearby to do the electronics work - fine. If not, Yanmar.

I would agree with Martini about the new Yanmar V8 370hp - I've used the 315hp and it was a pleasure to drive, but the V8 is a similar weight and I hear the price is OK. C'mon - Twin Turbos! Imagine the sound!

I have personally witnessed the demise and death of a Yanmar ZT350 leg (on the 315hp) and Yanmar have upgraded the clutch packs on them since. The ZT370 has this upgraded mechanism as standard but I'll be very interested to see how they perform over time. I hope to get a 100Nm spin on Saturday with the 315/ZT370 combination, so I'll report back...
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Old 30 August 2011, 05:02   #5
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Originally Posted by willk View Post
From what I hear, the Volvo is very nice but is very complicated - I'm told that they drop into "limp home" mode if they are not happy, and they're not happy quite often. If you have a Volvo dealer nearby to do the electronics work - fine. If not, Yanmar.

I would agree with Martini about the new Yanmar V8 370hp - I've used the 315hp and it was a pleasure to drive, but the V8 is a similar weight and I hear the price is OK. C'mon - Twin Turbos! Imagine the sound!

I have personally witnessed the demise and death of a Yanmar ZT350 leg (on the 315hp) and Yanmar have upgraded the clutch packs on them since. The ZT370 has this upgraded mechanism as standard but I'll be very interested to see how they perform over time. I hope to get a 100Nm spin on Saturday with the 315/ZT370 combination, so I'll report back...
That's my concern; i know about the electronic problems of the volvo's, but i'm also curious who stromg the new zt370 is..
we do a lot of towing here in shallow water, so the leg must be stronger compared to normal use.
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Old 30 August 2011, 05:08   #6
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If you're going to work the sterndrive really hard you might be better investing in something like this:

Konrad Marine Propulsion Products
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Old 30 August 2011, 05:19   #7
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Nice.
Probably pretty expensive and doesn't it create problems with the warranty of volvo?
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Old 30 August 2011, 05:51   #8
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Quote:
Originally Posted by Humber95 View Post
I currently have a Volvo penta KAD300 with dp-g leg in my Humber 9.5
I've had an incredible amount of problems with my engine, which even the dealers can't figure out.
startermotor turns but engine won't fire.
5 minutes later the engine fires but kills after releasing starterkey.
Then it won't start, and the supercharger clutch opens and closes when i push the stop button on the engine.
Sometimes when it starts, the rpm goes to 4000 in neutral and the gearbox switches itself into gear.
etc etc etc, all in different orders.
everything is replaced, from ECU to cable boom but nothing solves the problem.
If that was in a vehicle, with considerable experience in vehicle fault finding I'd be telling somebody to look for earth faults. Odd and apparently completely random occurrences are usually something to do with earth feeds, what happens is due to a bad earth things are often being back-fed power in the wrong direction from something else which might make them work normally but when they shouldn't, might make them work backwards, or might make them think something else is happening if a sensor earth is involved. Sometimes several items will share one earth point and what happens depends on which combination of them is active.

I don't know much about boat wiring - but I would imagine bad earths on a boat system would give similar results. Usually the best place to start on a vehicle is with a full wiring diagram and checking all of the main earthing points and there are likely to be several - in a 4x4 you would expect earths onto engine, maybe gearbox, certainly chassis and onto the body. All the connections have to be good and if they aren't, very random things can happen! Checking if there is a voltage from the earth on one of the faulty items back to a known good earth - usually use battery negative on a vehicle - is usually a good way to pick it up, because there shouldn't be anything and any sign of a voltage indicates a problem. Depending on how intermittent your problems are this can take a while to find though! Is the dealer able to reproduce your problems or do they just happen when you are out and about? Intermittent faults that can never be reproduced in the workshop are everybody's worst nightmare.
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Old 30 August 2011, 08:06   #9
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If that was in a vehicle, with considerable experience in vehicle fault finding I'd be telling somebody to look for earth faults. ...... everybody's worst nightmare.
That's nice long post but the Volvo engines use an isolated earth where there is no earth connected directly to the block or drive. I'm not suggesting it may not still be a negative fault but on my engine, it misbehaves if the block is grounded. I've no idea why.
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Old 30 August 2011, 15:09   #10
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Yanmar every time!
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