Kad 300 lagging

[Fishtigua]

FYI. The original superchargers were made by Wankel.

After market new turbos, never rebuilt ones, are the way to go.

 

[jon and michie]

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 .

Thanks Paul - I am thinking of just re sealing with instant gasket and checking the turbo spins to see if this helps first.
does the gasket sealant need to be high heat type like reinzosil 300 degree c

https://www.googleadservices.com/pa...hUKEwjkmtjfg63kAhULJ1AKHSQmDnoQ9aACCFc&adurl=

or could you recommend a particular sealant?

jon

 

[simonfraser]

probably a turbo issue, but b4 you rip it all apart install an inlet pressure gauge, that way you can tell for sure you have low boost pressure from either the supercharger or the turbo.
search for it on the forum, or wait for someone to copy the link back out again

 

[volvopaul]

What replacement turbos do you put in Paul?

I have them overhauled , 99% need new exhaust housing and a shaft kit as the exhaust fan wears out .

 

[petem]

I have them overhauled , 99% need new exhaust housing and a shaft kit as the exhaust fan wears out .

Thanks Paul. Who do you send them to? PM me if you like.

 

[jon and michie]

Thanks Paul. Who do you send them to? PM me if you like.

Interested for an end of season overhaul

jon

 

[jon and michie]

Right as an update.
I removed the turbo elbow and the turbo spins freely apart from surface rust the gap between the body and the the tips is minimal.
The o rings on the supercharger pipe where in good condition (they had a dab of a grease like substance probably to aid installation) but no sealant tge pipe just popped in.
However on the top of the supercharger the unit where the pipe inserts into - where it bolts to the main body of the charger there was a sooty bulid up and in one area the mating sealant looked like it was coming apart.
So my question now is what is the torque values of the bolts as I am thinking of replacing the sealant with a 300 degree C high temperature sealant.

 

[jon and michie]

Here's a picture from the internet of the supercharger
Its the 6 bolts that bolt the top part onto the main body That I am after the torque settings for.

here is a schematic diagram https://www.marinepartseurope.com/en/volvo-penta-explodedview-7738870-25-5099C.aspx
part number 18 with bolt number 19
jon

 

[BruceK]

The Book of Words gives the following :

Dimension Tightening Torques Nm lbt.ft

M5 6 4,4
M6 10 7,4
M8 25 18,4
M10 50 36,9
M12 80 59,0
M14 140 103,3

The supercharger connector pipes, both intake and
exhaust sides, should be locked with a silicon sealing
compound, for example Permatex® No.6 or Loctite®
Silicon sealant.

 

[BruceK]

Courtesy Farsco

https://www.dropbox.com/sh/pbb5mrpfyjlhf3h/AAAFm7z8GUaNV4chg3pWoGKVa?dl=0

Must be about the third time I’ve posted this link to my Dropbox

 

[jon and michie]

Thanks Bruce for your help.
Is the exhaust pipe the one that then goes off to the turbo?
Which is the inlet?
Jon

 

[BruceK]

Under is intake top is exhaust

 

[jon and michie]

Thanks Bruce
Jon

 

[jon and michie]

Right as a slight update - I cleaned the mating surfaces of the outlet/exhaust side of the super charger then applied reinzosol sealant tightened up - fitted the main pipe again applied a little sealant around the o rings and left for the next day.
straight away when I started the engine the difference in noise and accelaration in neutral mode was a night and day difference the engine seemed to tick over smoother - I put my hand around the out let areas and it was sealed up nice.
unfortunately due to my time restriction I could take the boat out to open the throttle out.

here are the pics of the super charger before strip down where you can see soot marks and broken sealant allowing air/gasses to escape and how thinly applied the sealant was.







What I was surprised at was that the outlet bend was made of plastic even though it appears to be cast iron on something that is an expensive piece of kit.

Jon