[Healeys] Transmission / Overdrive or Clutch slippage

[Bluehealey]

Team.
Coming at this from a different angle, the OP states that the car doesn’t move in reverse. This is usually a problem with the uni-directional (sprag) clutch.  Could it be that O/d is permanently engaged somehow rather than failing to engage?
Just a SWAG.

Alan - from my iPad

> On 21 May 2021, at 04:23, Henry G Leach via Healeys <healeys at autox.team.net> wrote:
> 
> Rafael-a few comments about your issues. I coming from a different place by assuming that the cone clutch is ok.
> 
> First, what oil is in the gearbox and transmission?-only use 30W NON detergent-all others will foam...especially with the addition of heat.
> 
> When the OD was rebuilt- there are two sets of springs of the 8...4 are 4-1/4" and 4 are 4-1/2" the longer springs must go to the outside and the shorter to the inside of the cone structure. If the springs are coil bound from misuse-replace them. If they are reversed the pressure to hold the clutch in direct drive is not sufficient.
> 
> The overdrive must achieve at least 400lbs of pressure at all times in use. The low numbers indicate an accumulator issue. O-rings or piston rings worn or misplaced.
> 
> It is exteamely important that the car never goes into reverse with the overdrive engaged.  Make sure the lockout switch is working.
> 
> Be sure the two check balls are in proper place 1/4" and 5/16" do not mix them up with each other.
> 
> Has your OD rebuilder done other Laycock overdrives? Hank
> 
> 
> 
> -----------------------------------------
> 
> From: "Rafael Abugattas via Healeys" 
> To: "healeys at autox.team.net"
> Cc: 
> Sent: Thursday May 20 2021 2:47:20PM
> Subject: [Healeys] Transmission / Overdrive or Clutch slippage
> 
> Hi all,
> 
> Last year I requested your help regarding a strange overdrive or slippage problem I have in my 1962 Tricarb BT7.
> 
> I received very valuable comments and suggestions but sadly the problem persists: Overdrive would not activate under any circumstances and when the engine / transmission is warm and we engage reverse, the engine revs but the car won´t move.
> 
> There is slippage somewhere in the transmission / clutch or overdrive. When the car is cold, reverse engages without any issues. This only happens in reverse gear after the car has been driven a few miles and the engine and transmission are warm. Forward gears engage all the time without any issues.
> 
> The car has been recently restored. Before the restoration the overdrive was operational. Now it’s not.
> 
> The transmission and overdrive have been taken apart and assembled twice looking for something visually wrong. Everything seemed to be OK.
> 
> The clutch and plate were also removed for inspection. The clutch was recently redone, adjusted and tested.
> 
> A friend suggested we should verify the oil pressure on the overdrive. On this link you will find a couple of videos of a test we have recently done with a manometer installed on the overdrive to check the oil pressure at different RPM´s.
> 
> https://www.dropbox.com/sh/t5p8kqz6v6yduyt/AADizyVMyBKPozy284B-udA4a?dl=0
> 
> The pressure on 3rd and 4th gears goes up to 400 psi and drops as it goes to lower gears. At idle is between 150 to 200 psi
> 
> In forward gears the car runs fine; the problem that we need to solve is that the overdrive would not activate(even though it is connected and everything seems visually OK) and the slippage we have when engaging reverse (the car won´t move) when the engine / transmission is warm.
> 
> We are located in Lima – Peru and as you may imagine, there are not many experts in this particular area of expertise.
> 
> Any thoughts or suggestions from you collective knowledge and wisdom on how to proceed will be much appreciated.
> 
> Thanks in advance!
> 
> Rafael
> 
>  
> 
> 
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