Barksavon
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| posted on 22/7/17 at 01:49 PM |
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Zetec ST170 Cylinder head refurb
I'm putting a ST170 engine in my Avon. I think the mileage of the engine is around 145000 so I'm considering taking the head off and
refreshing the valve seats etc. I'm using a Haynes manual for a standard zetec and am a bit confused over one issue. At present I've set
No 1 cyl to TDC on the compression stroke (as per the haynes) and got the crank
locked with the pin and the cams locked with the 5mm bar, I've taken the timing belt off. The manual states that the intake and exhaust cam
lobes of no 1 cylinder will be pointing upwards (though not vertical) and the valve clearances can be checked. Does this make sense?
The lobes of no 1 cyl cams on my engine at present are pointing out to each side of the cyl head.
Am I doing summat wrong , is the manual wrong or is it different for the ST170(apart from the fact the ST170 has the vvt)
Any advice etc very welcome
Thanks
Ian
[Edited on 22/7/17 by Barksavon]
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chris
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| posted on 22/7/17 at 06:10 PM |
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if you have the haynes zetec manual then the valve clearence measurements will be wrong any way the zetec engine has shims and the st170 has solid
machined lifters which can only be adjusted by an engineering shop if you have the engine at tdc and the cams locked then thats correct when taking
camshafts off i would number everything including the lifters cos they are machined to fit that valve
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snapper
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| posted on 23/7/17 at 07:30 AM |
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The cam rotates at half the speed of the crank so you may need to rotate the crank 1 more time to get the cam in the right position
I eat to survive
I drink to forget
I breath to pi55 my ex wife off (and now my ex partner)
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Barksavon
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| posted on 23/7/17 at 09:02 PM |
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Thanks for the replies. Didn't know about the machined lifters on the 170 engine so that's very useful. I did try turning the crank
further but as far as I can see the bar that locks the cams in place only fits in one position in a complete revolution because the slots in the ends
of the cams are offset....?
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chris
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| posted on 23/7/17 at 09:20 PM |
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yes thats correct the cams will only lock in one position you will have to excuse snapper paul he is only just about to make the move into modern
engines lol
you may find the locking bar might not fit cos the inlet cam may be advanced a little due to it not returning to the retarded position fully
[Edited on 23/7/17 by chris]
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Barksavon
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| posted on 23/7/17 at 09:30 PM |
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Snappers not the only one making his first move into modern engines... I'm fine with a pinto or an a series, fuel injection and vvt is a
completely new ball game for me and I'm getting on a bit now, hence every bit of advice is invaluable...☺
Thanks very much
Ian
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chris
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| posted on 23/7/17 at 09:47 PM |
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solid lifters means it can rev higher than a standard zetec
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chris
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| posted on 23/7/17 at 09:49 PM |
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i use the term modern engine loosely the zetec and st are 20 years old approx
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coozer
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| posted on 24/7/17 at 11:52 AM |
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Inlet cam on the st170 can float aboit a bit when theres no oil pressure ie not running.
1972 V8 Jago
1980 Z750
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Barksavon
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| posted on 24/7/17 at 06:01 PM |
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Can anyone tell me, Do i need to take the camshaft pulleys off to remove the cams and what do I do with the vvt unit, I can't take the head off
with cams in situ
Thanks
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rusty nuts
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| posted on 24/7/17 at 07:26 PM |
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Whatever you do do not use the camshaft timing tool to hold the cam whilst slackening or tightening the pulley bolts, use a proper cam pulley holding
tool . Not sure if the normal type fits the inlet cam on your engine though.
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Barksavon
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| posted on 24/7/17 at 09:07 PM |
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No the tool won't work on the ST170 inlet pulley
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