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HK Monaro steering box/steering
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Gerard Offline
#1 Posted : Tuesday, 18 April 2017 10:14:18 PM(UTC)
Gerard

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I have attached some photos of the steering box and pitman arm fitted to my car. This car is a HK GTS Monaro 307 factory 4 speed and was fitted with 16.7: 1 steering box. The lower section of the original steering box housing cracked so I replaced it with what I remembered to be another 20:1 steering box around 1976-77, as shown in the photos attached, . I don’t remember swapping over the original 16.7: 1 internals back then.

I have now had the car on the road since late December 2016 running 7 inch steel rims and Sumitomo 225/60 R14 tyres at 36 psi. I have done about 700 miles since registering the car and have found the car heavier to steer at low speed than I thought it would be (maybe just getting older) The last time I drove it was in 1978 with 8 inch rims all round so it's a fair while to try to compare. As part of the restoration I fitted new upper and lower ball joints, upper and lower inner control arm bushes, new inner and outer tie rod ends, I think the pitman arm is original, drag link is original, idler is a spare used item which I feel is ok and I have had an electronic wheel alignment done.

Jacked the car up recently and checked the number of turns of the steering wheel lock to lock. This came to just a little over 3 and if I have got that right this about matches the lock to lock turns for the 16.7:1 steering box? I am now thinking did I swap the internals over?

Some questions if someone can help are:
1. Are 3 and a bit turns lock to lock correct for the 16.7: 1 steering box?
2. If the 3 and a bit turns lock to lock is correct is there any possibility that the steering box shown is an original 16.7: 1 without the 16.7 : 1 stamp?
3. If the inspection cover is removed is there anything visible to confirm what ratio the steering box is?
4. What is the correct information on the pitman arm for the 16.7: 1 steering box fitted to these cars when power steering was not installed? Can anyone tell if the pitman arm shown in the photo is correct for the 16.7: 1 steering box in these cars? I will try to get a better image of this pitman arm for a future post

Regards Gerard
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gm5735 Offline
#2 Posted : Tuesday, 18 April 2017 11:48:53 PM(UTC)
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Originally Posted by: Gerard Go to Quoted Post


Some questions if someone can help are:
1. Are 3 and a bit turns lock to lock correct for the 16.7: 1 steering box?
2. If the 3 and a bit turns lock to lock is correct is there any possibility that the steering box shown is an original 16.7: 1 without the 16.7 : 1 stamp?
3. If the inspection cover is removed is there anything visible to confirm what ratio the steering box is?
4. What is the correct information on the pitman arm for the 16.7: 1 steering box fitted to these cars when power steering was not installed? Can anyone tell if the pitman arm shown in the photo is correct for the 16.7: 1 steering box in these cars? I will try to get a better image of this pitman arm for a future post

Regards Gerard



1/ Yes. The steering box by itself is 4-1/2 turns.
2/ Could be, but unlikely unless someone has swapped the internals.
3/ Yes, but not easy. The pitman shaft sector has the same number of teeth for both ratios, and is the same part number. The ball nut and worm are different between the ratios, and if you're lucky the ball nut may be marked. If you can count the balls in one circuit (not easy, tending to impossible) there should be 26 in each circuit for the 16.7 ratio. Side by side the 16.7 and 20:1 are easy to spot, as the worm is a coarser pitch for the 16.7. (The Rares one is about 18:1, but your car is unlikely to have one)
4/ The pitman arm should have the part number cast into it. For a non power steering car it should be 7432334. I cannot make it out in your photo, but the part number should be easy to see. (The power steering one is 7434813 and is easy to spot - different stud taper, thinner on one end and part number cast into it.)

I wonder what front end settings you used? The HK runs -1/2 to +1/2 degree caster, which makes it a bit lighter than the HT/HG at -1 to -2 degrees. Probably not enough to make the difference you are feeling, although lots of negative camber might.


The quick ratio is heavy at low speed by todays standards and I know one guy down here who does a roaring trade in power steering conversions for senior enthusiasts. I refuse to succumb.

You may just have to join a gym, or accept aging as a natural process!
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Gerard Offline
#3 Posted : Wednesday, 19 April 2017 9:40:11 PM(UTC)
Gerard

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Geoff
Thanks for the information in your reply. Had a look at a couple of steering boxes I have here and both are around 5-1/2 turns at the box so I believe these are 20.1 ratio. Neither of them feel real good. Will check with the person who did the wheel alignment as to the caster angle settings.
Pitman arm number is as best as I can read, as you said.
Thanks for the advice to join a gym, but I think in the short term I might pump up the front tyres a bit more instead of pumping iron and look to getting a 20.1 steering box in the car in the future.
Regards Gerard
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