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T120 Inlet cam rotory breather? #304136
03/20/10 11:48 pm
03/20/10 11:48 pm
Joined: Jun 2007
Posts: 98
oklahoma
K
knifesmashr Offline OP
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knifesmashr  Offline OP
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K

Joined: Jun 2007
Posts: 98
oklahoma
I'm rebuilding a 1971 T120. Does this motor require the rotary breather valve disc and spring that usually goes in the left case inlet cam bushing? One was not installed when I disassembled the motor.

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Re: T120 Inlet cam rotory breather? [Re: knifesmashr] #304137
03/20/10 11:55 pm
03/20/10 11:55 pm
Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
D
desco Online content
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desco  Online Content
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D

Joined: Nov 2008
Posts: 2,838
Bishop, Calif.
No. The engine breaths through the crank end into the primary case and out a tube to rear of the bike.


1968 T120R
1972 T120RV
Any advice given is without a warranty expressed or implied.
Re: T120 Inlet cam rotory breather? [Re: desco] #304139
03/21/10 12:19 am
03/21/10 12:19 am
Joined: Jun 2007
Posts: 98
oklahoma
K
knifesmashr Offline OP
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knifesmashr  Offline OP
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K

Joined: Jun 2007
Posts: 98
oklahoma
Thank you and much appreciated. Looks like I might be able to get these cases together tonight. Cheers.

Re: T120 Inlet cam rotory breather? [Re: knifesmashr] #304153
03/21/10 1:58 am
03/21/10 1:58 am
Joined: Jan 2008
Posts: 1,114
Noblesville, IN
Jack Adams Offline
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Jack Adams  Offline
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Joined: Jan 2008
Posts: 1,114
Noblesville, IN
FWIW,it breaths through the main bearing on the primary side due to the seal not being there. Repeat,No seal on the crank. Jack

Re: T120 Inlet cam rotory breather? [Re: Jack Adams] #304168
03/21/10 4:55 am
03/21/10 4:55 am
Joined: Jun 2007
Posts: 98
oklahoma
K
knifesmashr Offline OP
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knifesmashr  Offline OP
BritBike Forum member
K

Joined: Jun 2007
Posts: 98
oklahoma
Thanks! That helps a lot too. This is my first Triumph build and I've been going off the Four Aces vid, a Haynes manual, and the factory parts book.

Re: T120 Inlet cam rotory breather? [Re: knifesmashr] #304260
03/21/10 9:36 pm
03/21/10 9:36 pm
Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
Ken Holby Offline
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Ken Holby  Offline
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Joined: Apr 2008
Posts: 192
Clarksburg, WV USA
I have a '70 TR6R and all of the books show a breather, but it doesn't have one. Inside the "drive side" case you'll notice 3 or is it 4 small holes by the cylinder wall. It breathes there, plus the main bearing. So, you can sleep tonight - lol.

Last edited by Ken Holby; 03/21/10 9:37 pm.

'70 TR6R Chop (always in process)
Re: T120 Inlet cam rotory breather? [Re: Ken Holby] #304599
03/24/10 12:46 am
03/24/10 12:46 am
Joined: Jun 2007
Posts: 98
oklahoma
K
knifesmashr Offline OP
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knifesmashr  Offline OP
BritBike Forum member
K

Joined: Jun 2007
Posts: 98
oklahoma
I have 3 small holes in the case. Thanks! I do feel better.


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