Kamd300a Supercharger cutting in and out

[Mad_4_h2o]

I’m got twin kamd300a on edc. The port engine seems to be working fine apart from using more fuel than the starboard engine and there noticeable black smoke and the transom is black around the exhaust. The starboard engine has a fault, it will running smoothly upto 2800rpm and then the supercharger will keep cutting in and out until you get to 3000rpm. I’ve checked the wiring, relays, fuses, fuel pipes, boost sensor and I’ve plug it in to diagnose the fault but nothing comes up. I’m tempted to swap the edc over it check it’s not that but it quite a bit of work. Has anyone else had this problem? Thanks

 

[briggs]

Turbo is bad, and injectors need replacement. Those issues won’t throw codes

 

[briggs]

Also check wiring going to supercharger sounds like a ground fault

 

[petem]

Some good advice above.

Turbos on the engines fail at around 15-17 years. OEM replacements from a Turbo shop are around (£750) or £2k+ from VP.

Send the injectors off for testing. They'll probably need new tips. Budget for £800-£1000 or so for two engines with labour (more if using a franchised VP dealer). Get the valve clearances checked at the same time.

Whilst the engineer is at the back of the engines, change the RPM sensors at the same time. Buy Bosch ones from eBay for £40 a pop.

Pete

 

[volvopaul]

This question has been asked a million times of late .
worn turbo.

 

[Sneds]

Agree. Same thing on KAD44 last year

 

[Portofino]

Arh the KAD 300 Well here was my experience folks .
The turbo longevity is variable .
Mine lasted 5 yrs .
-The the blade tips burn out due to excess EGTs due to fouled stern gear and hull .
- The housing itself corrodes away and crusts bits flake way increasing the turbine gap loosing boost .
- A regular used fresh water lake boat s turbo will last longer than a winter layered up sea water boat . Regular use is better .
- Incorrect oil used or infrequently changed leads to premature bearing failure.

Any one of combination of the 4 ^^^ will knackered them .

The exhaust horn rusts away and the elbows also corrode away .Look for tell tale orange spots starting to come through the green paint .
Theses are on top of water pump shaft seals weeping .
Yes only a sadistic psychopath would route the metal inflexible fuel lines over the rocker box necessitated complex removal or risking kinking by bending attempting a short cut .
Once you have accessed the valve gear and adjusted the final kick in the nuts is the lack of any gasket when replacing the cover / rocker box . Saved €2 Thx VP ! not !
The squirt on stuff is from a DIY perspective a bit Heath Robinson .Your KAD 300 will weep oil for ever more .
Nether mind adds , to the water pump shaft weeping and black dust disease from the belts due to corroded pulleys .
A tripple wammy , full house . .


Hows the alternator ? Drenched it yet with sea water checking the silly positioned strainer ?
ECU suffered from vibration and heat soak attached to the engine yet .What were they thinking not using a remote box ?

Anyhow enjoy the supercharger whine ……..while it lasts A unique dimension to boating .

 

[Mad_4_h2o]

This question has been asked a million times of late .
worn turbo.

Hi Paul
Would I be worth swapping the turbos over to double check it’s definitely the turbo that is worn and not an electric issue? Thanks

 

[Mad_4_h2o]

Also check wiring going to supercharger sounds like a ground fault

The wiring seems all fine on the multi meter. I’m going to get the injectors all check once I sorted the issue out with the supercharger cutting in and out. Thanks

 

[Mad_4_h2o]

Some good advice above.

Turbos on the engines fail at around 15-17 years. OEM replacements from a Turbo shop are around (£750) or £2k+ from VP.

Send the injectors off for testing. They'll probably need new tips. Budget for £800-£1000 or so for two engines with labour (more if using a franchised VP dealer). Get the valve clearances checked at the same time.

Whilst the engineer is at the back of the engines, change the RPM sensors at the same time. Buy Bosch ones from eBay for £40 a pop.

Pete

 

[Mad_4_h2o]

Thanks pete

I’m going to price up a turbo tomorrow and hopefully find one at a good price.

I’ve check the resistance on both RPM sensors and they are both the same. Thanks for the advice

 

[DavidJ]

Turbos on the engines fail at around 15-17 years.

Mine failed at 16 yrs so spot on. Even though I’ve only done 450 hours it’s time exposed to a salt water environment that kills them.

 

[DavidJ]

I’m going to price up a turbo tomorrow and hopefully find one at a good price.

I hope you don’t really mean ONE
I was advised on here to replace both because the other will only go next year, meantime you will get an imbalance. It’s a nice feeling to put turbo problems behind you. (….and move onto the next problem!!!)

 

[petem]

Would I be worth swapping the turbos over to double check it’s definitely the turbo that is worn and not an electric issue? Thanks

Take the exhaust elbow off and take a photo of the exhaust side of the turbo. Post a photo and we'll confirm the turbo is knackered.

 

[petem]

I’ve check the resistance on both RPM sensors and they are both the same. Thanks for the advice

I wouldn't bother, just replace them. They're £40 each and if they're not failing now, they soon will be.

 

[jon and michie]

Take the exhaust elbow off and take a photo of the exhaust side of the turbo. Post a photo and we'll confirm the turbo is knackered.

That's probably one of the quickest ways to diagnose turbo failure

 

[jon and michie]

I’m going to price up a turbo tomorrow and hopefully find one at a good price.

I got mine reconned for £650 last year and works a charm guaranteed for 2 years and got a stainless insert welded in to prevent corrosion

 

[DavidJ]

I got mine reconned for £650 last year and works a charm guaranteed for 2 years and got a stainless insert welded in to prevent corrosion

Using my man-maths it’s worth paying £200 more for brand new Borg Warner one.

 

[Mad_4_h2o]

Here’s a picture of the turbo in question

 

[Mad_4_h2o]

Here’s a few more