Toyota 2H motor Vaccum pump???

Submitted: Thursday, Mar 27, 2003 at 13:06
ThreadID: 4087 Views:1202 Replies:4 FollowUps:3
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Just wondering about the vaccum pump on these things?
I have a '85 60 series and checked the length of the vanes in my pump.
They are 23mm.
According to the workshop manual from toyota its 40mm
and from gregorys it is 35mm for early models and 40mm on later ones
I also rang toyota and he measured one for me and was 23mm for the 2H motor.
So now im really confused.
I took it off to check as i seem to run out of vaccum ocassionally as my warning light comes on occasionally for brakes and pedal goes hard as rock.
But it seems to be in good condition after checking .
I have done the other checks for the power booster and it seems ok
too.
Would the pump with 40mm vanes be better in regards to keeping up
enough vaccum?
regards Lee

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Reply By: Tony - Thursday, Mar 27, 2003 at 13:30

Thursday, Mar 27, 2003 at 13:30
Lee at a guess and it's only a guess the 40mm pump is for the latter model which has vaccum assisted clutch so it needs a bigger pump to provide for both.
AnswerID: 16247

Follow Up By: surfer - Thursday, Mar 27, 2003 at 17:13

Thursday, Mar 27, 2003 at 17:13
thats a good reply Tony as mine is a auto model.
but im still wondering why the manual hasnt mentioned the one with 23mm vanes
Also mine is a sahara and it seems to run out of vaccum after brakes have been applied several times quickly such as in city driving.
im thinking of changing my booster but i think its functioning fine...
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FollowupID: 9974

Reply By: haze - Thursday, Mar 27, 2003 at 17:39

Thursday, Mar 27, 2003 at 17:39
I had a 1985/75 with similar prob. On pulling apart found the rotor to housing end clearance to be about .035", machined the housing to give about .005" and no more problem. Check condition of internal splines however as they do wear and if strip whilst driving could be big drama!
AnswerID: 16270

Follow Up By: surfer - Thursday, Mar 27, 2003 at 20:31

Thursday, Mar 27, 2003 at 20:31
thanks for that
Ill check the end float .
What length were the vanes in your pump?
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FollowupID: 9987

Reply By: haze - Thursday, Mar 27, 2003 at 21:00

Thursday, Mar 27, 2003 at 21:00
g'day surfer. the vanes were 23mm, bought new ones when the vac. started to deteriorate but was not the cure! I also think the spline wear occurs when you switch the motor off and it rocks back and forth against compression. mine had done about 300k. when sold and the wear was noted. Did all my own service/ maint. so should you have any other problems there is a good chance I could assist ( L/cruisers being consistent in their idiosyncrasies!!)
AnswerID: 16290

Reply By: haze - Thursday, Mar 27, 2003 at 21:00

Thursday, Mar 27, 2003 at 21:00
g'day surfer. the vanes were 23mm, bought new ones when the vac. started to deteriorate but was not the cure! I also think the spline wear occurs when you switch the motor off and it rocks back and forth against compression. mine had done about 300k. when sold and the wear was noted. Did all my own service/ maint. so should you have any other problems there is a good chance I could assist ( L/cruisers being consistent in their idiosyncrasies!!)
AnswerID: 16291

Follow Up By: surfer - Thursday, Mar 27, 2003 at 22:04

Thursday, Mar 27, 2003 at 22:04
My end float is .012" or .3mm
Ill check the runout or wear on splines tomorrow
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FollowupID: 9997

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