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Old 24 October 2021, 10:35   #1
Member
 
Country: Norway
Town: Bergen
Boat name: James pond
Make: Askeladden beetle
Length: 6m +
Engine: Mercruiser 1.7tdi
Join Date: Oct 2021
Posts: 5
Sometimes turbo not winding up on my Mercruiser 1.7tdi. is it a wastegate problem?

Hi, new boatist here with a question for all you boatanists.
Basically, i can get my boat up to plane from cold with the turbo working fine, but if I throttle down to idle for a few seconds ( to change drivers for example) and then throttle up to try to plane the boat again, it wont rev more than 2000rpm, and the turbo wont kick in. It takes a minute or so of waiting on idle / stopping / starting the engine before it goes back to normal again. ( this doesn't happen all the time, but it's becoming more frequent)
Any ideas?


P.s im new here, plus im new to boateneering, so be gentle.
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Old 24 October 2021, 14:43   #2
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Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 3,016
Probably wastegate sticking open they are very troublesome on that engine, usually stick closed & run overboost & melt no 6 piston. Sounds like yours is sticking open after your first run & not closing again until it cools slightly

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Old 24 October 2021, 15:22   #3
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Country: Norway
Town: Bergen
Boat name: James pond
Make: Askeladden beetle
Length: 6m +
Engine: Mercruiser 1.7tdi
Join Date: Oct 2021
Posts: 5
Quote:
Originally Posted by beamishken View Post
Probably wastegate sticking open they are very troublesome on that engine, usually stick closed & run overboost & melt no 6 piston. Sounds like yours is sticking open after your first run & not closing again until it cools slightly

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Thanks bro, I'll get it looked at straight away!
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Old 24 October 2021, 15:47   #4
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Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 3,016
Quote:
Originally Posted by Steve10001 View Post
Thanks bro, I'll get it looked at straight away!
Haha just noticed my typo, no6 piston, it should have said no4.
If you unbolt the wastegate actuator via the two bolts you can operate the wastegate back & fourth & squirt with wd40 or similar. Worthwhile checking its free now & then because if it sticks shut it becomes terminal & you dont know until the damage is done

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Old 25 October 2021, 17:22   #5
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Country: UK - Wales
Town: Cardiff
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These are based on the gm/fiat car/van motor iirc not sure if parts are interchangeable but from when I was looking you can buy running car with engine for the price of a wastegate from merc………

https://www.rib.net/forum/f36/cummin...nce-77948.html
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Old 26 October 2021, 03:40   #6
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Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 3,016
Quote:
Originally Posted by HDAV View Post
These are based on the gm/fiat car/van motor iirc not sure if parts are interchangeable but from when I was looking you can buy running car with engine for the price of a wastegate from merc………

https://www.rib.net/forum/f36/cummin...nce-77948.html
I've had a few of these in bits & yes they are the Isuzu built engine used in Astras etc. The block & head are the same, starter & iirc alternator from some vehicles fit. Gaskets & filters can be used from the cars. Crucially the pistons injection pump & injectors all differ so its not a straightforward swap. That said many folk have fitted automotive pistons & they do run, how long for is anyones guess. The life expectancy of those engines in a sports boat or rib isnt good so maybe cheap rebuilds are the way to go. Heat exchanger and intercooler both suffer corrosion & should be kept a close eye on.
Overloading is the quickest way to kill one & they should be slightly under propped. Prop for 4600rpm wot & just never go there & your not far away & unbolt the wastegate actuator regularly and check the wastegate is free. When the wastegate sticks the engine performance actually improves because they overboost so folk think its going great when actually its destroying itself.
Run lightly loaded carefully maintained they are a gutsy frugal engine but neglect or flog one at your peril.

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Old 26 October 2021, 07:38   #7
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Country: Norway
Town: Bergen
Boat name: James pond
Make: Askeladden beetle
Length: 6m +
Engine: Mercruiser 1.7tdi
Join Date: Oct 2021
Posts: 5
What if I buy a turbo guage - or is there any sort of alarm i can get that will warning me if the turbo or pressure is acting up?
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Old 26 October 2021, 07:40   #8
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Country: Norway
Town: Bergen
Boat name: James pond
Make: Askeladden beetle
Length: 6m +
Engine: Mercruiser 1.7tdi
Join Date: Oct 2021
Posts: 5
Quote:
Originally Posted by beamishken View Post
I've had a few of these in bits & yes they are the Isuzu built engine used in Astras etc. The block & head are the same, starter & iirc alternator from some vehicles fit. Gaskets & filters can be used from the cars. Crucially the pistons injection pump & injectors all differ so its not a straightforward swap. That said many folk have fitted automotive pistons & they do run, how long for is anyones guess. The life expectancy of those engines in a sports boat or rib isnt good so maybe cheap rebuilds are the way to go. Heat exchanger and intercooler both suffer corrosion & should be kept a close eye on.
Overloading is the quickest way to kill one & they should be slightly under propped. Prop for 4600rpm wot & just never go there & your not far away & unbolt the wastegate actuator regularly and check the wastegate is free. When the wastegate sticks the engine performance actually improves because they overboost so folk think its going great when actually its destroying itself.
Run lightly loaded carefully maintained they are a gutsy frugal engine but neglect or flog one at your peril.

Sent from my SM-G950F using RIB Net mobile app

Steve10001
Join Date: Oct 2021
Posts: 4
What if I buy a turbo guage - or is there any sort of alarm i can get that will warning me if the turbo or pressure is acting up?
Any other tips to prevent damage?

Also, is there a better engine to swap it out with? ans what are the prices for an OK one in the UK. Im in Norway.
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Old 26 October 2021, 08:20   #9
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Country: UK - England
Town: Farnborough
Boat name: Nostromo
Make: Arrow
Length: 8m +
Engine: 600hp V8
Join Date: Jul 2003
Posts: 1,761
That's the old joke isn't it about stuff running the best it's ever run just before a blow up.

Quote:
Originally Posted by beamishken View Post
When the wastegate sticks the engine performance actually improves because they overboost so folk think its going great when actually its destroying itself.
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Old 26 October 2021, 17:07   #10
Member
 
Country: UK - Scotland
Town: north ayrshire
Boat name: charlie girl
Make: reiver 3.8/regal3760
Length: 10m +
Engine: 40hp 2st 2x6lp 315
Join Date: Jul 2009
Posts: 3,016
Quote:
Originally Posted by Steve10001 View Post
Steve10001
Join Date: Oct 2021
Posts: 4
What if I buy a turbo guage - or is there any sort of alarm i can get that will warning me if the turbo or pressure is acting up?
Any other tips to prevent damage?

Also, is there a better engine to swap it out with? ans what are the prices for an OK one in the UK. Im in Norway.
A boost guage might help & regular checking & exercising of the wastegate is a must. Ensuring the engine isn't over loaded by being overpropped is a good start, Folk think ill fit a bigger pitch prop & reduce the rpm so its less stressed by not reving so hard when actually the opposite is true. Prop for 4600rpm wot but stay well below that and your good.
Not many conversion options to be honest at that compact size. A smaller volvo or yanmar diesel might go with some adaption, alternatively the 3.0 merc petrol is an easy swap. Or fit an outboard & gain a bigger, faster lighter boat. Not much advantage in the diesel nowadays unless your somewhere like the west of Scotland where petrol is hard to get.

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