Kad 300 lagging

jon and michie

jon and michie

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Hi - I have found this weekend that the engine would get to 2500rpm easily but would take a while to get to 2900rpm never mind any higher.
I opened the hatch whilst docked and started the engine and looked at the supercharger clutch which appears to be engaging.
But I did notice at the rear of the charger where a large black pipe goes in air appeared to be coming out.
Should the connection between the charger and the pipe be air tight?
If this is the cause of the "engine lag"
Is there some sort of seal kit that is easily available.
And is it an easy fix?

An opinions welcomed
Jon
 
Sounds like stuck turbo to me too. The supercharger cuts out at 2800 so that's all you will get, allowing for error on rev counters etc. If you remove the funny shaped black elbow that goes from the air box assembly to the turbo inlet, ( remove the two cap head bolts and release the jubilee clips on the rubber pipe and jiggle it) you may be able to gently free it off with a socket on the turbo shaft and turn it gently backwards and forwards. It may just have gone bit rusty on the exhaust side. Doesn't take much to make them stick. Worth a try.
 
Not sure which black pipe you mean, there's a few on a KAD.
Once you have sorted the turbo, start the engine from cold so the supercharger engages and feel for any air leaks then. If there is one they sometimes "whistle"
 
Thank you for your replies - does make sense regarding stuck turbo which I will attack in about a month when I am back at the boat.

Kashurst - the black pipe I am referring to is the one coming out of the supercharger about 40mm wide made of steel which goes past the coolant tank.

Jon
 
Yes that needs to be airtight. Youve lost all your charge boost. Im surprised you even got to 2900 rpm tbh.
 
kashurst said:
Sounds like stuck turbo to me too. The supercharger cuts out at 2800 so that's all you will get, allowing for error on rev counters etc. If you remove the funny shaped black elbow that goes from the air box assembly to the turbo inlet, ( remove the two cap head bolts and release the jubilee clips on the rubber pipe and jiggle it) you may be able to gently free it off with a socket on the turbo shaft and turn it gently backwards and forwards. It may just have gone bit rusty on the exhaust side. Doesn't take much to make them stick. Worth a try.
Click to expand...

Didnt realise it cut out at 2,800 - thought it was lower. When does turbo kick in ?
What do other KAD300 users cruise at given WOT is 3,800/3,900 ?
And what for best £ efficiency ?
Have to say i have found 3,000 good value (£75 / hr with 25 knots in Targa 40) but this year thinking i've been thinking of 3,100/3,200
Is running fraction slower at present with some fouling
 
No. Ogura must have had some contract with Volvo as they do not divulge which root charger it was, or if it was specially made or what. Just in their blurb that they provided Volvo with root chargers. However now that Volvo does not supply these parts any more I surmise you would be able to get from Ogura direct and if not then one of their units should fit. Take measurements. They all provide the same boost across the board and they all operate within the same rev ranges compatible to the reduction ratio on the pulleys. So as long as the mounting and manifolds fit you are good to go, hence why I said you'd need to take measurements for the correct unit and you may need to change the clutch pulley size but you will be able to replace the Volvo branded unit with potentially a bit of faffing if not an exact fit.

And pleasantly I will bet you can get them an awful lot cheaper than rebranded units too if turbos are anything to go by.
 
Last edited:
The output housing has no gasket , it leaks , reseal with instant gasket .

Replace the o rings on steel tube .
Take the elbow off the turbo , check it spins .
Replace the oring on the elbow .
Remove the cross pipe from the turbo to the intercooler, replace both o rings .

Out of interest I’ve replaced 7 turbos this month , 3 to fit tomorrow and Thursday, that shows how crap they are .
All engines underperforming.
A range of 32/ 41, 44 and 300 .
 
volvopaul said:
The output housing has no gasket , it leaks , reseal with instant gasket .

Replace the o rings on steel tube .
Take the elbow off the turbo , check it spins .
Replace the oring on the elbow .
Remove the cross pipe from the turbo to the intercooler, replace both o rings .

Out of interest I’ve replaced 7 turbos this month , 3 to fit tomorrow and Thursday, that shows how crap they are .
All engines underperforming.
A range of 32/ 41, 44 and 300 .
Click to expand...

What replacement turbos do you put in Paul?
 
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