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HelicopterThunder TigerOther › R90 gear mesh
05-01-2004 04:09 AM  13 years agoPost 1
claysmith

rrApprentice

In a van, down by the river

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I just put the 91t main gear in my R90 with the 11t pinion and it doesnt fit properly. The pinion gear is barely touching the main gear. It makes alot of noise when running also. Is there any way to fix this? I see alot of people using the 8.27 ratio with the Cspec, so I think it should work. The 93t gear fit fine but this one isnt right. Any help would be appreciated.

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05-01-2004 04:36 AM  13 years agoPost 2
twinsticks

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South Jersey

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you need to ajust the pinion in closer to set the proper gear mesh

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05-01-2004 05:06 AM  13 years agoPost 3
Salty

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St. Augustine

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The way you do that if ya dont know is loosen up the four cap screws that hold the pinion carrier in the frames (two on each top side right near/under the collective tray, and two a inch or so below that) clarify there is four cap screws on each side of the frame....I have found the easiest way to do this is with the engine removed, stick a finger up in the clutch bell and one on top of the start shaft and move it towards the main gear...make sure its square and has a good mesh, then re tighten down

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05-01-2004 05:15 AM  13 years agoPost 4
Raffy

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Chicago, Illinois

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Refer to the Raptor 90 manual on page 39 section 6-1 about Setting up Gear Backlash.

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05-01-2004 05:19 AM  13 years agoPost 5
Salty

rrElite Veteran

St. Augustine

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I agree...after rereading my post there is some things I left out.... (sorry)
thats what happens when you run 10 miles swim 3 miles and hump 60 lbs on your back for 2 miles then go home and lay 4 pallets of sod..then stay up till the but crack of dawn on runryder

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05-02-2004 02:48 AM  13 years agoPost 6
claysmith

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In a van, down by the river

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Thanks, i got the mesh right and now the gear is smooth. What is the best way to tell if the engine is aligned properly?

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05-03-2004 03:04 PM  13 years agoPost 7
Notarheli

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Phoenix, AZ

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I align the engine by turning the start shaft and finding the most free condition while locating the engine in the frame. I then verify everything by turning the start shaft (by finger and thumb) while turning the fan. This way I can make sure the alignment is good through the whole rotation of the fan. Depending mostly on the fit of the start shaft to the one way clutch, you should be able to turn the start shaft with just one finger. And, once done and running, you should be able to stop the start shaft from spinning with light finger pressure. Note that sometimes you may have to loosen the bolts that secure the engine to the engine mount. This can effect the right to left alignment. Of course, there's very little movement here but it can still help in the finer adjustment of the parts.

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05-04-2004 07:29 AM  13 years agoPost 8
Unbalanced

rrVeteran

Melbourne, Australia

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- to add - its also worth using a calibrated eyeball and check that it looks good from top to bottom in comparision with the frames (engine mount should be parallel with the front of the frames). Last check is the bolts for the top bearing housing and the engine mount should be in the same position in the slots.

It is possible to get the alignment good with the startshaft, but have the whole assembly (engine + pinion & shaft) at an angle with the frames.

Jeff

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05-04-2004 05:37 PM  13 years agoPost 9
Notarheli

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Phoenix, AZ

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Jeff,
I agree.
I include in the process ensuring the pinion gear is parallel to the main gear by sighting edge of tooth to edge of tooth. I also use the edge of the frames to the edge of the motor mount to ensure parallelism. But, this could give you a false indication as the frames may not be in line with each other for various reasons. I know mine are and so I know that the motor mount should be at equal distance from the frame edge. Yes, you can actuall tighen it all down with the engine cocked rotationally (what a word) in the frames.
All that being said, anytime I remove the engine, I just put it back in the same spot, with relation to the frame edge. I still do the start shaft bit though as my eyes can't see the frame to mount difference of say .003 which the start shaft can pick up when rotating it. Know what I mean?

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HelicopterThunder TigerOther › R90 gear mesh
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