Morgan 382 Gearbox question
- Thread starter j_o_2
- Start date
dave_a
Dave Ahlers
I have the 150 in my boat. If you go to the Hurth/ZF website, check the hp ratings for the different 10 & 15 gearboxes.
You'll see that 10 has very little "over capacity when behind the Perkins. If the money is close, I think the 150 is a better choice for longevity / ICW type of coontinuous use.
There is less than a quart of oil in these gearboxes. Heat is the enemy to lifespan. There are water cooled attachments for these as well.
Contact Trans Atlantic Diesel, and take Sherri's advice.
Dave
You'll see that 10 has very little "over capacity when behind the Perkins. If the money is close, I think the 150 is a better choice for longevity / ICW type of coontinuous use.
There is less than a quart of oil in these gearboxes. Heat is the enemy to lifespan. There are water cooled attachments for these as well.
Contact Trans Atlantic Diesel, and take Sherri's advice.
Dave
Hi thanks for all the input " i have a 2nd hand 150 in Ireland that i was thinking of shipping out to grenada but if i have to re-align the gear box "maybe it would be better to just re-bild the box i have as getting anything done in Grenada is like sending a man to the moon an i think a rebild kit is about the same price as i can buy the 2nd hand box for..
dickkilroy
Richard Kilroy
The current ZF 10 is a weaker tranny. I had to replace the tranny on my Catalina 38 with a Universal 5424 3 cylender Diesel with it. I was advised to check your linkage and make sure it is fully engaged either way to avoid excessive wear. Very important per the mechanic who replaced it. He had to replace it as his mechanic employee who was servicing it did not replace the oil and it failed.Cost him his job.
Dick
Dick
Gary -
The re-alignment must be done locally, and does not require opening up the tranny box. It is for aligning the transmission box to the propeller shaft. If you took a perfectly good transmission off the propeller and off the engine, then put it back on, you need to re-align the transmission to the propeller.
Tightening each transmission bolt to the flywheel housing must be done to a certain torque, and an alignment gauge should be used to ensure the transmission's end-plate lines up square with the propeller shaft's face plate. There are three axis that need to align on the face of the end-plate - horizontal (the two face-plates are both dead-center of the boat), vertical (the two face plates are both at the exact same height), and in line with the prop shaft (the transmission's short shaft rotation is facing dead center back, at the same downward angle as the prop shaft).
Even a difference of a few hundredths of an inch can put unwanted vibrations and forces on the prop shaft, which will have negative reprecussions on the cutless bearing.
The re-alignment must be done locally, and does not require opening up the tranny box. It is for aligning the transmission box to the propeller shaft. If you took a perfectly good transmission off the propeller and off the engine, then put it back on, you need to re-align the transmission to the propeller.
Tightening each transmission bolt to the flywheel housing must be done to a certain torque, and an alignment gauge should be used to ensure the transmission's end-plate lines up square with the propeller shaft's face plate. There are three axis that need to align on the face of the end-plate - horizontal (the two face-plates are both dead-center of the boat), vertical (the two face plates are both at the exact same height), and in line with the prop shaft (the transmission's short shaft rotation is facing dead center back, at the same downward angle as the prop shaft).
Even a difference of a few hundredths of an inch can put unwanted vibrations and forces on the prop shaft, which will have negative reprecussions on the cutless bearing.
One other thing you need to also check if switching out transmissions. The forward gear ratio of both should be the same, or you will have to make a change in your propeller pitch. I had a Hurth HBW 150 with a forward ratio of 2.68/1. Worked well with my prop of 16/12. I had it rebuilt twice in 16 years, and while in Panama in late 2012, it failed again. I bought a ZF 15M (direct replacement) which has a forward gear ratio of 1.98/1. I am now over propped and cannot exceed about 2300 engine RPM without the engine overheating. Searching the archives on this site it appears that if the transmission forward ratio is around 2/1, the prop should have an 11 inch pitch. If I ever find a place down here in the Western Caribbean countries that has a prop shop, I will have the prop repitched. Meanwhile, I chug along under engine power making 5 knots at 1500 engine RPM and 7 knots at 2200 RPM as needed