50hp Perkins won't rev past 1900rpm

[SkiprJohn]

Here's one that might work.

http://www.amazon.com/Handheld-Digit.../dp/B009T4REQG

I see they are a bit cheaper on eBay.

[Hoohaa]

Originally Posted by SkiprJohn

Here's one that might work.

http://www.amazon.com/Handheld-Digit.../dp/B009T4REQG

I see they are a bit cheaper on eBay.

Thanks Skip. I picked one up through the week.
I have attached this pick of the engine. Is this the correct pulley? or is it the one above it?
Jeff
VOLVO D255 front notes1.jpg Views: 186 Size: 29.3 KB ID: 108920" style="margin: 2px" />

[Uncle Bob]

Originally Posted by Hoohaa

Thanks Skip. I picked one up through the week.
I have attached this pick of the engine. Is this the correct pulley? or is it the one above it?
Jeff
Attachment 108920

Yep, thats the crankshaft pulley.
All the best, Bob.

[Hoohaa]

Thanks Bob.

OK Then. Checked it yesterday and low and behold The tacho is reading 1200 while my new digital laser thingy was reading 1900. 700 RPM!!! Difference.

The 3 year mystery has been solved

A huge thanks to all that have ponded this question on my behalf. The process of elimination has won out in the end. Very glad I didn't go down the governor dismantling track.

Regards Jeff

[Uncle Bob]

Originally Posted by Hoohaa

Thanks Bob.

OK Then. Checked it yesterday and low and behold The tacho is reading 1200 while my new digital laser thingy was reading 1900. 700 RPM!!! Difference.

The 3 year mystery has been solved

A huge thanks to all that have ponded this question on my behalf. The process of elimination has won out in the end. Very glad I didn't go down the governor dismantling track.

Regards Jeff

Jeff, it might be worth checking to see if the tacho can be adjusted to read correctly. Mine has a screw on the back that apparently allows adjustment.
Just a thought, cheers.

[SkiprJohn]

Congratulations!!!

Well done.

Now it's time to go through the thread and see who might have suggested an error in tachometer reading just to see if it was mentioned early on.

[Hoohaa]

Originally Posted by SkiprJohn

Congratulations!!!

Well done.

Now it's time to go through the thread and see who might have suggested an error in tachometer reading just to see if it was mentioned early on.

Originally Posted by ddsailor25

If its not a fuel problem or filter problem at this point i would borrow a light tack and see if the Tachometer is working correctly. Your other option is to take the boat out and see if you can make hull speed, but at a lower RPM than usual. I dont know how your tack works, but mine is off the fly wheel with small magnets. Sometimes it needs to be adjusted. If the tack is working fine then I would look into your exhaust and see if its carboned up. As the back pressure increases you'll lose power. This can happen with extended battery charging.

Dave

Well just spent the last hour combing through the thread and found 2 geniuses that can hold there heads up hi.
Thank you Skip, ddsailor and all of the other contributors. I wish I could say its been a fun ride.. But, I have learnt allot and feel allot more confident working on my engine. Just need someone else to have a low rev problem so I can hand on my hard won pearls of wisdom.
Great job everyone.