[Healeys] HD8 Su's

[Bob Haskell]

Roger,

 From a BJ8 factory parts list, the damper part number is AUC 8112.  
Burlen's web-site states that the damper is available in two versions - 
plastic top (AUC 8112) and brass hexagon top (AUC 8112 HB).  They're 
vented, so the suction chamber must be non-vented.  Not sure if HD8 
suction chambers are ever vented.

So no idea where the oil is going?  The needle and the inside of the 
piston are dry?  The outside of the suction chamber is dry?

Cheers,

Bob Haskell
Austin Healey 3000 BN7/BT7 registrar

On 6/15/21 5:41 PM, gradea1 at charter.net wrote:
> Roger-those are the wrong dampners!  The HD8 used the plastic topped 
> ones and the length of them, compared to the brass, may be different- 
> thus the oil slipping by. Brass ones used on earlier carbs.  Hank
>
> -----------------------------------------
>
> From: "Roger Grace via Healeys"
> To: "Healeys"
> Cc:
> Sent: Tuesday June 15 2021 9:53:07AM
> Subject: [Healeys] HD8 Su's
>
> For the SU experts ..
> Have posted about this problem before  - and no, it has not gone away.
> Bought new (not rebuilt) HD8 carbs from SU/Burlen about 7k miles ago.
> Problem is excessive use of damper oil.
> Have to top up about every 1.5 tanks of gas usage.
> Ultra careful about filling properly and to feel resistance about 1/2 
> in above the thread.
> Have tried all grades of oil from 20 wt to thick gear oil with no 
> change apart from accel. response times. Currently using SAE 30 nd.
> SU have no real ideas either.
> They are encouraging me to purchase new dampers - pn AUC 8112HB ... 
> pricey too.
> I am not convinced that will solve it but will do so.
> There is some very minor scuffing on the valves. See photo.
> The pistons drop freely and there is the classic clunk when raised 1/8 in.
> Perhaps this is normal ? maybe other owners don't check their dashpots 
> as frequently ? heavier springs to limit movement ?
> any ideas as to what gives most welcome ?
> rg
>
>
>
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