Right or left-hand rotation?

[ty oxley]

Hi I have read this thread and started the conversion. someone has told me there is a oil galley behind the idler gear as the idler gear has to be moved to the other side the oil gallery has to be drilled out does anyone know if this is the case.

Thanks


To change from RH to LH rotation on a V71 or a V92 series engine will require quite a bit of work.

(1) The camshafts are different between RH & LH engines even though they rotate the same direction on both engines. The cam lobes are located in different places. if you try to use the cams from a RH in a LH engine it won't turn over because of the valves contacting the pistons. Bill Gerrie over on the other board tried to reverse a 8v71 without changing the cams and had it lock up. Also the idler gear and the crankshaft gear has to changed or the cams will be spinning backwards.

(2) On the 92 series the crankshaft depends on the serial # if it can reverse direction or not. A easy way to tell is if the oil passages are drilled straight through (can you see through it?) you CAN reverse the direction of the crank.

If you cannot see through the crankshaft, the passages are drilled at an angle to improve oil flow. That crankshaft is designed for a specific rotation do NOT try to reverse it.

As far as I know from looking and reading ALL 71 series cranks can be reversed.

(3) The oil pump is crank driven, so that has to be changed. Plus you have to swap the bypass valve to the other side of the block.

(4) The starter will have to be replaced.

I bought my bus with a tired 6v71 LH and was given a 6v92 RH that needed rebuilt. I have personally done this conversion and had success, but I am a heavy equipment mechanic by trade. If you are not a mechanic, I would advise you to buy the PROPER rotation engine to begin with as it is not as simple to reverse an engine.

Check out this thread.
http://www.busnut.com/bbs/messages/233/13788.html

HTH,
Dale
[/quote]

To change from RH to LH rotation on a V71 or a V92 series engine will require quite a bit of work.

(1) The camshafts are different between RH & LH engines even though they rotate the same direction on both engines. The cam lobes are located in different places. if you try to use the cams from a RH in a LH engine it won't turn over because of the valves contacting the pistons. Bill Gerrie over on the other board tried to reverse a 8v71 without changing the cams and had it lock up. Also the idler gear and the crankshaft gear has to changed or the cams will be spinning backwards.

(2) On the 92 series the crankshaft depends on the serial # if it can reverse direction or not. A easy way to tell is if the oil passages are drilled straight through (can you see through it?) you CAN reverse the direction of the crank.

If you cannot see through the crankshaft, the passages are drilled at an angle to improve oil flow. That crankshaft is designed for a specific rotation do NOT try to reverse it.

As far as I know from looking and reading ALL 71 series cranks can be reversed.

(3) The oil pump is crank driven, so that has to be changed. Plus you have to swap the bypass valve to the other side of the block.

(4) The starter will have to be replaced.

I bought my bus with a tired 6v71 LH and was given a 6v92 RH that needed rebuilt. I have personally done this conversion and had success, but I am a heavy equipment mechanic by trade. If you are not a mechanic, I would advise you to buy the PROPER rotation engine to begin with as it is not as simple to reverse an engine.

Check out this thread.
http://www.busnut.com/bbs/messages/233/13788.html

HTH,
Dale

[ty oxley]

Hi I have read this thread and started the conversion. someone has told me there is a oil galley behind the idler gear as the idler gear has to be moved to the other side the oil gallery has to be drilled out does anyone know if this is the case.

Thanks