| Author |
Message |
Bud 4104-4104 (24.69.161.104)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 20, 2003 - 8:25 pm: | |
I have a line on a RA inline 671 but I need a left hand rotation I understand I have to switch some gears around and possibly change some gears also on the oil pump; do I just switch the inlet to the outlet and visa versa will the same cam work everyone I talk to I seam to get different answer |
Henry R. Bergman, Jr. (Henryofcj) (65.194.145.33)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Thursday, February 20, 2003 - 11:04 pm: | |
I THINK you can change rotation with just a seal/gasket and maybe a bearing kit. However, believe the entire mill MAY have to be torn down to do it correctly.
Some help here...please. We did this with some 4-53 mills we swapped into pickup trucks years ago. Adapted a marine engine with opposite rotation.
BELIEVE MAYBE the pistons/crank have to be turned around/reversed as there MAY be a slight offset in the pin/crank dimensions. CAN NOT remember. Sorry. Also the timing gears.....
.....need to be swapped around, the cam and balance shafts switched/rotated, a new starter hung, different water pump, etc., etc.,. You will also need to find out which side the blower should be on.....
....as well as which side the exhaust should be. In line Detroits can be configured/reconfigured in many different ways. You need a REAL Detroit expert, not me. Good luck. Henry of CJ. |
Geoff (Geoff) (66.238.120.2)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 21, 2003 - 8:31 am: | |
Bud, if you find a 71 inline manual at the front they show the different configurations that 6-71's can be built into. Like Henry mentions the blower and exhaust can be on either side, which means the cam can be on either side. There is a LH and a RH rotation cam, and the timing gears can be left or right helix. The seals on the crankshaft ends are rotational, but the crank on a 71 series works in either direction (unlike a 92 series). Do you have the model number of the RH engine you are looking at?-- I could look up the configuration.
--Geoff
'82 RTS CA |
bud 4104-4104 (24.69.161.104)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 21, 2003 - 11:44 am: | |
Geoff, I don't have the model # as yet. I have a 71 inline manual and I've been looking at the configurations I've been told all I have to change the crank shaft gear and switch the idler gear to the opposite side but I can't see how the helix will line up You say the cam are different for L and R ? I'll get the model number ,will help;thanks Bud |
Guy Bouchard (161.184.192.172)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 21, 2003 - 2:57 pm: | |
When you change rotation for a detroit,all that happens is that you change the rotation of the crankshaft;(which drives the oil pump and the water pump). By moving the idler gear at the rear of the engine, the camshaft now turns in the same direction as it always did;(likewise blower and all the valvetrain). So basically all you need to check for is oil pump and water pump rotation. It's not quite that simple, but almost.
Guy 4905 |
Geoff (Geoff) (66.238.120.2)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Friday, February 21, 2003 - 5:23 pm: | |
Okay, if the "camshaft turns in the same direction as it always did" wouldn't the firing order be wrong if the crank is now turning the other direction? Tha's why you have to change the cam. The water pump doesn't have to be changed, but the oil pump does along with the other stuff I mentioned previously. |
John Feld (Deacon) (204.184.224.47)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Monday, February 24, 2003 - 10:41 pm: | |
Geoff, I may be wrong about this as it has been around 30 years that we changed a marine DD over for a truck. I beleive all we had to do with the cam is pull it and reverse it, as well as the rest you mentioned. |
Geoff (Geoff) (66.238.120.46)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, February 25, 2003 - 1:16 pm: | |
You can't reverse the cam because the thrust washers would then be on the wrong side. Plus I don't think the cam lobes would be correct either, but I would have to look to answer that one for sure.
--Geoff |
Jim Wilke (12.46.52.74)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, February 25, 2003 - 4:02 pm: | |
When you change the drive gears, you replace the crank & idler gears with ones that have an opposite helix. Then you install the idler on the opposite idler gear shaft (there's two, one to drive the right & one to drive the left upper gear). When you do that, you then are driving the timing, cam & all the accessories the same way you were before even though the crank is turning the opposite way. Thrust bearings & washers are happy. I think the oil pump has a jumper pipe or something to move.
I'd set the two engines up together & compare parts & function.
Jim-Bob |
Dwight (67.213.8.131)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, February 25, 2003 - 11:22 pm: | |
The oil pump has to be replaced ... experience talking here..... |
Dwight (67.213.8.131)
Rating: N/A
Votes: 0 (Vote!) | | Posted on Tuesday, February 25, 2003 - 11:30 pm: | |
O' one more thing, on a "V" engine you have to swap the cam, take the one on the left and put it on the right, doing this makes all of the helix gears fit, if you look at the engine firing order, turning the opposet way everything works out right swaping the cams side .. the gears should have left hand and right hand markings on them .... I have some 8v71 gears here, I will look at them tomorrow the verify the markings......
O' and yes the front and rear seals have to be changed and on the crank the newer engines have bi-rotaional cranks on them, you need the engine number for detroit to verify if it is a bi-rotaional crank, this is true for the 71 and 92 engines... |