| Author |
Message |
Bud4104
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, December 26, 2005 - 6:10 pm: | |
Can anyone tell me what has to be done to an inline 6-71N Detroit with RH rotation to change the rotation to LH. I've read several threads but they seem to deal with 6V and 8V detroits.
Thanks
Buddy |
Tim Hoskinson (Tdh37514151)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, December 26, 2005 - 8:02 pm: | |
Hi Bud to change the 671 in line from right hand to left hand you need to change the timing gear on the crank shaft and the idler gear to opposite helical angle and install the idler gear on the right side of the block. Also the oil pressure regulator housing will need to be removed from the oil pump and turned around to reverse the flow for the oil pump. Changing rotation is fairly simple as only crank shaft rotation is reversed the top end of the engine rotates the same in both style engines. Depending on the desired blower arangment that job can get a bit bigger. A style= blower left exhaust right B style = blower left exhaust left. c style = blower right exhaust left d style = blower right exhaust right.These combinations can all be achieved by reversing the crank shaft and cylinder head. Tim |
Nick Morris (Nick3751)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, December 26, 2005 - 8:03 pm: | |
never mind tim got ya. |
Geoff (Geoff)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, December 27, 2005 - 11:06 am: | |
Besdies what Tim wrote, you also have to change the cam to LH firing order. The cam and balance shaft on the new engine might be on the wrong sides. The front and rear crankshaft seals are directional, and you will probably have to use the flywheel housing off your old engine.
Changing over an engine to a different rotation is not for the weekend maintenance mechanic.
--Geoff
'82 RTS AZ |
Dale L. Waller (Happycampersrus)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, December 27, 2005 - 7:57 pm: | |
Some of the inline crankshafts cannot be reversed. The best way to tell if it can be reversed is to check to see if the main journals are drilled straight through. Make sure you can see through the journal.
If the main journals are drilled 90 degree offset it cannot be reversed. If that is the case you'll need a crank. The 90 degree cranks were designed for better bearing lubrication on RH engines.
It has been my experience that some of the unserviceable cranks have been replaced with the newer 90 degree drilled cranks from the 6-71 inline turbo engines during an overhaul.
If your engine has never been rebuilt this shouldn't be a problem. Just check before you get too deep.
This happens on the V92 series also as well as the 71 inline series. Just more rare on the 71 series.
A good alternative is to look for a 80's era transit with a 6-71T engine. Thats a great & easy repower for 4104. Just a thought if you have to pull your engine anyway.
Dale |