North American Turbocoupe Organization



Valve Tapping
rairbird Offline
Senior Member
#1
I have developed a tap in the valve train. Don't know where yet, but I have read posts that suggest that the number 1 adjusters go first. Also, that this may be due to clogged oil galleys. Only thing I couldn't find was the cure. I am thinking obviously of finding the bad lifter, but I don't want this to happen again. All the lifters are new (3000 miles) and so are the followers. Should I open up the allen plugs in the head and blast some air through there and then change the oil. If not, what is the procedure?

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87 T/C, 5sp., Ported/Polished head, 1.89, 1.59 S.S Valves. Motorsport Lifters, A-234 cam, ported lower, gutted upper intakes, Rod's S/S headers, 3" DP, T3/T04E 46, Gillis BCV, K&N Air Filter, 42LB injectors, kirban Adj. FPR, Walbro 255 FP, Diablo chip, Head and Main studs, APR rod bolts.
The next mod is to install the GN intercooler.
88 T/C stock, 5sp.
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Pete D Offline
Administrator
#2
If the head was done properly, it was hot tanked, with the galley plugs out so the oil passage could get cleaned also, in theory.

Have you checked the gap between the follower and the heel of each cam lobe, with the HLA fully compressed?
Pete Dunham


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rairbird Offline
Senior Member
#3
No, I haven't Pete. When I got the head back it was hot tanked, but I assembled the cam, followers and HLAs. It was running fine until this tapping just happenned. I guess I will have to pull the cover off, pull the HLAs out , compress them, measure them, and hopefully I will find the culprit. I was hoping I could eliminate at least 2 valves and concentrate on the front ones, but I may as well measure them all. I will let you know what I find. Thanks

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87 T/C, 5sp., Ported/Polished head, 1.89, 1.59 S.S Valves. Motorsport Lifters, A-234 cam, ported lower, gutted upper intakes, Rod's S/S headers, 3" DP, T3/T04E 46, Gillis BCV, K&N Air Filter, 42LB injectors, kirban Adj. FPR, Walbro 255 FP, Diablo chip, Head and Main studs, APR rod bolts.
The next mod is to install the GN intercooler.
88 T/C stock, 5sp.
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Pete D Offline
Administrator
#4
Everything has to be assembled. You compress the HLA using a spring compressor exerting force on the HLA instead of the spring. When it's compressed then use feeler gauges between the heel of the cam lobe (base circle) and the follower. The desired gap is 0.040 to 0.050". The service limit spec is 0.035 to 0.055". Cleaning the HLA might be good also
Pete Dunham


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rairbird Offline
Senior Member
#5
That's good to know. I was going to take them all out and compress them in a vise, re-assemble them and then check the lash. But it sounds a lot easier your way. Thanks
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Jeff K Offline
Administrator
#6
If you remove them and compress them in aise, as soon as you take it out of the vise, it will re-expand due to the internal spring.

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Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 20 psi, forced air intercooler, water injection, bypass valve, Ranger roller cam, subframes, etc., etc.. // 86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP nitrous, ignition, gears, suspension, etc., etc.... // 91 Escort: Bone stock winter car // 02 Taurus Vulcan(wifes car)
Jeff Korn

88 Turbo Coupe: Intake and exhaust mods, T3 turbo at 24 psi, forced air IC, water injection, BPV, Ranger cam, subframes, etc., etc.
86 Tbird 5.0 (original owner): intake, exhaust, valvetrain mods, 100 HP N2O, ignition, gears, suspension, etc., etc.
05 Taurus SEL Duratec daily driver
04 Taurus Duratec (wifes car)
02 Pontiac Grand Prix GT
95 Taurus GL Vulcan winter beater
67 Honda 450 Super Sport - completely customized
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rairbird Offline
Senior Member
#7
So, Jeff, are you saying that I have to compress them and measure them while they are compressed, or do I compress them, remove the tool, then check the clearance. I am a bit confused now because of the internal spring.
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Pete D Offline
Administrator
#8
You have to hold them in the compressed position while checking clearnces.
Pete Dunham


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rairbird Offline
Senior Member
#9
Thank You Pete. All is clear now.
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