[Healeys] Vernier timing gears

[Chris Dimmock]

Hi Wayne,
From a quick internet search on the head markings of your "aviation bolts" they are at best approx grade 5 (120 KSI) equivalent, cad plated steel bolts. Nothing special. 
The Rollmaster bolts you have shown look to me like grade 8 (150 KSI) unbrako style cap head bolts. 
The Rollmaster Vernier timing kit tells you at least 3 times (on the packaging, and in the instructions) to Locktite these bolts. 
If I was going to change these bolts, I'd go up to 180 KSI ARP bolts, not down to grade 5 120 KSI bolts.  
Our Healey Club (AHOC NSW) sells the  Rollmaster Vernier kits and we have had no issues reported. 
Bob Spidell has recently had this timing set installed in his newly rebuilt engine. 
Best
Chris



Sent from my iPhone
> On 6 Jul. 2017, at 1:43 am, Wayne <waschu2 at gmail.com> wrote:
> 
> Hello,
> 
>          I am getting back to my Healey 3000 engine rebuild after two years.  I bought the Roller master vernier timing gear set from Moss at that time.  I have previously used the Roller Master gear set with multiple key ways to adjust the cam timing with no problems on other rebuilds. What I don't like about this set is that the cap screws used to clamp the vernier gear to the hub are not very robust. Working in aviation I have AN-4 bolts that I can replace the cap screws with and safety wire them to prevent slippage.  Has anyone using this kit had problems?  I could keep the cap screws and Loctite them. This is a street car, not a race car. Pictures are one bolt installed and the hardware side by side.
> 
> Wayne
> 
> 
> <IMG_2537.jpg>
> <IMG_2540.jpg>
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