have you looked at your crank pulley lately?

[captainluigi]

well i did & am disturbed by how much wobble was evident. appx. 1/8 to 3/16. difficult to measure precisely. never noticed this before. only comparison i have are my GM 454's in my C.C. they are true & wobble free. after 28yrs & 2200 hrs. any input?

[qship96]

My stomach blocks my view of my crank pully,hard to check it for wobble!

[Q45tech]

Obviously improper belt torques can place abnormal stresses on pulley.

Since the crank pulley has tiny balance weights [from the building process and vibration test] the question is how to select a replacement.

[captainluigi]

o.k. makes sense. what are probable case scenarios? not you Qship, sounds like your already experiencing worst case scenario. well tech, where do i go from here? am i awaiting mass destruction. live with it? what am i replacing? weights or pulley?

[captainluigi]

after search & re-search i see nothing but new o.e. has anyone done this w/out removing rad & a/c? i'm pissed.

[sijoko]

well i did & am disturbed by how much wobble was evident. appx. 1/8 to 3/16. difficult to measure precisely. never noticed this before. only comparison i have are my GM 454's in my C.C. they are true & wobble free. after 28yrs & 2200 hrs. any input?

My 95 Q had the wobble in the balancer. It bothered me so I swapped in another one from a low mileage engine and guess what....it still wobbled. It seems to me the wobble occurs only at idle and goes away as soon rpms increase.

[TBrack]

mine had a slight wobble when my brand new belts were on too tight, just loosened them and it worked itself out. I'm not an expert like Dennis though so idk.

On a side note I think sijoko is trying to see who can have the biggest Ron Paul sign in their sig

[tmorgan4]

Obviously improper belt torques can place abnormal stresses on pulley.

Since the crank pulley has tiny balance weights [from the building process and vibration test] the question is how to select a replacement.

Are the bolts inside the crank pulley used for balancing. The bolts are "randomly" placed, and some are screwed in further than others.

[mxr662]

after search & re-search i see nothing but new o.e. has anyone done this w/out removing rad & a/c? i'm pissed.

I removed mine (to do my chain guides) without removing the ac condenser. The radiator was easy to remove.

[captainluigi]

well upon closer inspection w/better lighting & a measuring device it seems the run out from true appears to only be a 1/16 to 3/64. not as bad as was first reported. however, is there an allowable tolerance? maybe everyone can now rise from their lazyboy recliner, go have a look at thier own crank pulley & report back asap.

[captainluigi]

still want some input about others pulley. using a mirror & brite lite i can see that is does have a section of rubber making this a harmonic balancer i think. it looks entirely possible to change it out with just removing fan & rad. a friend has a right angle air impact tool, puller & tons of advice as long as the beer lasts.

[silver2k2]

While doing my active to standard conversion I replaced mine. Which was necessary to run the normal pump instead of the active. I did it no problem with radiator in. If buying used its good to know Active, Touring and Base use different crank pullys. (Dont ask me how I know)

Active has a wider belt to run the bigger PS/Active PumpTouring also has a wider belt to run the the bugger PS Rear Steering pump

[captainluigi]

dennis, if my understanding is correct the crank pulley was balanced on the engine. providing the current one is the original what do i replace it with? what would you do if it were yours? ISO can have one @ my door in a week. i seriously doubt me having the abilities or tech tools to balance it to eng. R&R seems rather straight forward. what are my options? thx

[Q45tech]

Per SAE article every early Q45 engine was balanced prior to installing in vehicle and then vibration acoustic signature measured at idle and cruise rpm and compared to MASTER signature.

You'll see the same thing assorted tiny rivets in different holes in the flywheel.

Never bothered to examine 94 to see if or when they stopped these expensive practices.

[qship96]

All that special attention paid to reduce vibration, yet they screw up on the most basic items like chain guides and transmission cooling

[captainluigi]

what are the potential problems that might occur if left as is?

[JeffTepper]

On vintage Fords, the crank pulley also contains the harmonic balancer ring which is connected to the pulley by a rubber ring. As the car ages, the rubber gets brittle and eventually cracks causing the balancer ring to shift on the pulley. In extreme cases the balancer can actually separate. Does the Q45 have a similar setup??

[Q45tech]

Yes, but in addition to the rubber vibration supression ring there are tiny weights added to bring the system close to perfection.

The problem is even a gram of extra [different] rotating weight can be significant at 6900 rpm.............beats bearings to death.

[bullittandy]

All that special attention paid to reduce vibration, yet they screw up on the most basic items like chain guides and transmission cooling

X2, what a complete waste for all that effort to have the engine destroy itself with bad chain guides.

[captainluigi]

dennis, have you heard the one about the guy that pulls into T3 and says, ''my crank pulley wobbles, whats it going to take to fix it?'' what im trying to accomplish here is to obtain a definitive answer from some one (you) who knows the correct & proper fix. i am not ungrateful for the others responses so far it's just that it seems there is something i'm not getting. quite possibly that may be because of my ignorance of such matters. a previous post of yours posed the question, now what to replace it with? well that is my question to. what have you done in the past?

[Q45tech]

All T3 can do is replace the pulley and hope the wobble goes away.

I don't believe there is the equipment in Georgia to spin balance an engine and measure and resolve any imbalance in an assembled engine to properly select the balance weights needed on the crankshaft pulley.

Common to spin balance crank shafts with simulated weights [rods, pistoms rings, wrist pins] called bobb weights.http://www.schenck-usa.com/bro...y.pdfh ... /c...r.htm

Race car engines don't need to be pefectly smooth just survive the race.

If the crank shaft had the wobble the front main seal would fail.

[captainluigi]

thank you, that was the answer i needed. will replace w/oe asap.