I have been told that switching from foward and reverse and back, etc is bad if you are switching into neutral and letting the rpms fall before you switch into F or R. this same guy told me that it was ok to switch from F to R and R to F with a few RPMS on the tach. I always thought that this would be hard on the transmission. The post earlier I made was on idle RPM's which I was told to set the engine idle at 1000 RPMS and not any lower or else the engine will vibrate alot. If I haven't confused you yet my question is: Will changing from F to R at 1000 RPMS not damage your transmission???
transmission questions
- Thread starter Traumaguard
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Don't Do It
Let it idle down. Since we don't know if you have a high or low RPM diesel, it is hard to figure how much the impact of a 1000 RPM hit is on the trans, but try to let it idle down at least most of the way. As to idle speed, let it idle where it is supposed to. A good engine manual will clarify a lot of these questions and others. About the only thing I will say is that my manufacturer's representative suggested we kick the RPM's up if we had to be idling for long periods. That is by throttle, not idle adjustment. RD PS: Update. I just read your other thread and there was a link to a technical bulletin (which I did not read). If in fact the technical bulletin concerns your engine and recommends a 1000 RPM idle speed, than that's what it should be, and that should settle it. Mine is 600-800 RPM on a Yanmar.
Let it idle down. Since we don't know if you have a high or low RPM diesel, it is hard to figure how much the impact of a 1000 RPM hit is on the trans, but try to let it idle down at least most of the way. As to idle speed, let it idle where it is supposed to. A good engine manual will clarify a lot of these questions and others. About the only thing I will say is that my manufacturer's representative suggested we kick the RPM's up if we had to be idling for long periods. That is by throttle, not idle adjustment. RD PS: Update. I just read your other thread and there was a link to a technical bulletin (which I did not read). If in fact the technical bulletin concerns your engine and recommends a 1000 RPM idle speed, than that's what it should be, and that should settle it. Mine is 600-800 RPM on a Yanmar.
With an automatic transmission in a car
would you shift into reverse while going forward at 20 MPH? or shift into drive while going backward at 3/4 throttle? Why would anyone think that doing such in a boat is good practice?
would you shift into reverse while going forward at 20 MPH? or shift into drive while going backward at 3/4 throttle? Why would anyone think that doing such in a boat is good practice?
Get a manual
It depends on your transmission. Some use bands that wrap around a drum to transfer power and some us gears. The band type can be safely shifted at any RPM but the trans is not the issue here it is the rapid reversal of the prop which may not be a fixed type and can be pretty hard on it. The manufacture clearly stated that the trans can take it but the rest of the power train may not be able to and so made the recommendation to not change gears at high RPMs. It is nice to know that you can get away with it in an emergency though. Get your manual and read it.
It depends on your transmission. Some use bands that wrap around a drum to transfer power and some us gears. The band type can be safely shifted at any RPM but the trans is not the issue here it is the rapid reversal of the prop which may not be a fixed type and can be pretty hard on it. The manufacture clearly stated that the trans can take it but the rest of the power train may not be able to and so made the recommendation to not change gears at high RPMs. It is nice to know that you can get away with it in an emergency though. Get your manual and read it.
Hurth?
UNIVERSAL DIESEL WITH HURTH TRANSMISSION When shifting transmission, engine RPM should be returned to idle, then shift transmission firmly from one direction to another. A slight pause in neutral will allow propeller to slow and add life to transmission The transmission is designed to permit reversing at full engine speed. TO BE USED ONLY IN THE EVENT OF AN EMERGENCY!
UNIVERSAL DIESEL WITH HURTH TRANSMISSION When shifting transmission, engine RPM should be returned to idle, then shift transmission firmly from one direction to another. A slight pause in neutral will allow propeller to slow and add life to transmission The transmission is designed to permit reversing at full engine speed. TO BE USED ONLY IN THE EVENT OF AN EMERGENCY!
XMSN
Any change in gears should be made with the engine at low idle. Then, as Richard said, the shifting movement should be brisk...don't ease it into gear, make it a firm positive movement of the gear shift lever.
Any change in gears should be made with the engine at low idle. Then, as Richard said, the shifting movement should be brisk...don't ease it into gear, make it a firm positive movement of the gear shift lever.
r u kiding
any good boatsman knows u always hesitate between forward and reverse to let prop stop its rotation
any good boatsman knows u always hesitate between forward and reverse to let prop stop its rotation
If This Is
a Universal with a Hurth, my manual also says to shift confidently from forward to neutral, then from neutral to reverse, and vice-versa. Don't push the lever slowly or hesitantly: commit it to the shift.
a Universal with a Hurth, my manual also says to shift confidently from forward to neutral, then from neutral to reverse, and vice-versa. Don't push the lever slowly or hesitantly: commit it to the shift.
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