North American Turbocoupe Organization



Tapping noise source possibilities
1988turbotbird Offline
Senior Member
#1
Hey everyone,

So i'm chasing this tapping noise from under the valve cover. Took the valve cover off and on cylinder 2 and 3 a few of the rocker arms have some mild impact marks on them where the valve stem meets the end of the rocker arm. When I rebuilt the motor, I went to advance auto and got a new ranger cam and roller rocker arms, since the first start up, the tapping noise has always been there, hot or cold. I first tried swapping out the hla's for some wide groove ones from a friend, still there. Got some known good stock hla's and put them in, noise still there. I wanted wake it up more, so I got a good new to me turbo head and had it completely rebuilt and ported, polished, new stock size stainless steel valves with double spring valve springs and new valve retainers installed. I put my ranger cam, hla's and roller rockers back in and the tapping is still there! Im starting to think its not a ranger cam or something. A little while ago I checked the clearance between the cam lobe and the roller wheel and pretty sure they were all ok. My issue is the cam isnt it? All I know about the cam is they told me it was a ranger cam. The cam, hla's (only two sets) and roller rockers are the only things that have stayed the same during my diag process. What the heck?
88 TC/HX35/CAI/3" exhaust/Wilson MS2/Beanman header/Head Work/Laramee Cam/Gillis boost controller/3G alt/Walboro 255 fuel pump/BOV/CHE rear control arms/1" lowered/poly. bushings/Chuck W mounts/6 puck clutch/Pro 5.0 shifter/AEM wideband/Tuning MS..
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1988turbotbird Offline
Senior Member
#2
Anyone?
88 TC/HX35/CAI/3" exhaust/Wilson MS2/Beanman header/Head Work/Laramee Cam/Gillis boost controller/3G alt/Walboro 255 fuel pump/BOV/CHE rear control arms/1" lowered/poly. bushings/Chuck W mounts/6 puck clutch/Pro 5.0 shifter/AEM wideband/Tuning MS..
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Not B Anymore Offline
Administrator
#3
Can you get some video of the noise? It might help for diagnosis. I've had some tapping ever since installing the RR cam as well. I've just been ignoring it for the last two years...
Brian Leavitt
'86 TC 5-Speed -- MS2x w/COP | 83 lb. injectors | T3/T4 50 Trim Stage 3 .63AR | Full 3" Exhaust - No Cat | Motorsport FMIC | Ranger Roller | Ported E6 | Walbro 255HP | Kirban | 20psi | 120-amp 3G | 8.8" 3.55 rear | '03 Cobra Wheels
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RDOG Offline
Posting Freak
#4
Sometimes the tapping sounds like it coming from the top, but it is actually coming from the bottom. Usually means a bad rod bearing, but I hope not for your sake.

Post some video as B suggested.
1986 Turbo Coupe. Boport StageIII head, Boport 2.1, Performance Techniques 50 trim hybird, StageII.63, stinger 3" exhaust, Phenolic spacer, Boglog header,NPR FMIC intercooler setup, kirban fpr, bigrmotorsports fuel rail, diablo water meth kit, CAI, remote mount TFI, CHE rear adj control arms, MAC girdle, 8.8 rear disc, aluminum drive shaft, H&R lowerings springs Tbird Turbo Specific, y MAS!!
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Pete D Offline
Administrator
#5
You should probably mic the cam base circle. That will tell you if it's a RR or if somebody ground one undersized for higher lift by reducing the base circle. Then go through and check for clearance. See this thread for more info on that. Let us know what you find. http://natomessageboard.com/ubbthreads.p...Post179100

Other threads:
http://natomessageboard.com/ubbthreads.p...Post121225

http://natomessageboard.com/ubbthreads.p...Post111935
Pete Dunham


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TurboE Offline
Posting Freak
#6
You could probably try thicker wieght oil and see if the noise lessens any. It sounds like you've changed the complete top end and still have the same issue. If the rod and crank bearings are worn your oil pressure won't be as high as it should be and could cause the top end to not get as much oil pressure and the HLA's not to pump up as much as they should, hence tapping. Someone correct me if I'm wrong about the oiling system. I know I tried a few things to fix my tapping issue years back and after I decided to rebuild the engine I noticed the tolerances way out of spec and not even round, thanks to the previous owner. A rebuild fixed my tapping issue. Not saying you need that but a heavier wieght oil change is a simple test if you've tried everything else.
-88 TC Black
5spd, Precision SC50 T3/T4, QH/SD Tune, Gillis, AFPR, 255FP, WB O2, K&N, Ported E6, 3" DP, ATR 2.5" Duals, 3:73 Rear, Konis, Eibachs, 18" Voxx Wheels, X Drilled Rotors.
-06 G35 Coupe Diamond Graphite
-97 Pathfinder
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TurboE Offline
Posting Freak
#7
Not saying you should keep running it with a thicker weight oil but running it for a few minutes as a test to see if a difference is made could help troubleshoot the issue...
-88 TC Black
5spd, Precision SC50 T3/T4, QH/SD Tune, Gillis, AFPR, 255FP, WB O2, K&N, Ported E6, 3" DP, ATR 2.5" Duals, 3:73 Rear, Konis, Eibachs, 18" Voxx Wheels, X Drilled Rotors.
-06 G35 Coupe Diamond Graphite
-97 Pathfinder
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5.0TurboCoupe1988 Offline
Posting Freak
#8
my completely rebuilt 2.3 w/ranger roller has ticked since day one and everything is within spec. it runs fine, so i don't worry about it. i've put over 8k on it with no changes and no problems...and some of those miles were pretty hard.

are you sure you're not hearing the injectors firing?
1988 TC 2.3/5-Speed, 148K
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1988turbotbird Offline
Senior Member
#9
B-alright I'll get a video of it on youtube and post a link. Its kinda noisy and I cant help but think its robbing performance!

Rdog-this tapping is defiantly from the top in the valve train. Im 99.9% certain its tapping because of the impact marks im getting on the surface between the valve stem and the rocker arm contact. I believe its down to the cam base circle isn't correct or the hla isn't sitting high enough in the bore. Which makes me heavily lean toward a cam issue because its been in the equation the whole time.

Pete- I'll look for a mic and check the base circle of the cam. I don't know what spec i'm looking for but technically if every lobe base circle should match, so I should know right away correct?

Turbo E- I'm currently running 10W-30 full syn mobil 1, I switched from 5W-30 full syn to 10W-30 for that exact reason and it barely changed at all. The motor was totally rebuilt from top to bottom. Like I was saying to rdog, I have impact marks from the valve stem hitting the rocker arm on a few of the rocker arms. The valves aren't damaged but the rocker arms affected have taken a mild amount. Hard metal! haha
88 TC/HX35/CAI/3" exhaust/Wilson MS2/Beanman header/Head Work/Laramee Cam/Gillis boost controller/3G alt/Walboro 255 fuel pump/BOV/CHE rear control arms/1" lowered/poly. bushings/Chuck W mounts/6 puck clutch/Pro 5.0 shifter/AEM wideband/Tuning MS..
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1988turbotbird Offline
Senior Member
#10
5.0, nope not the injectors, the tapping is coming from under the valve cover
88 TC/HX35/CAI/3" exhaust/Wilson MS2/Beanman header/Head Work/Laramee Cam/Gillis boost controller/3G alt/Walboro 255 fuel pump/BOV/CHE rear control arms/1" lowered/poly. bushings/Chuck W mounts/6 puck clutch/Pro 5.0 shifter/AEM wideband/Tuning MS..
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