Skip the auto shop - Our mechanics make house calls

Q: If HB has TDC mark in wrong location, will it still work?

asked by on

I bought a new Harmonic balancer off eBay for my 99 Toyota 4Runner 3.4L. When it arrived, I placed it next to the original HB. The mark for TDC on the new HB is in a different location then the mark on the original HB. The original HB has the mark to the drivers side when placed on the crankshaft with crankshaft at TDC. The new HB has the mark on the passenger side when placed on the crankshaft with the crankshaft at TDC. As long as I have the crankshaft and both cams aligned to TDC, will the new HB still work properly even though the mark for TDC does not line up with the numbers on the timing cover?

A: Hello. As long at the timing marks on the c...

Hello. As long at the timing marks on the crank and camshafts are aligned as they should be then the engine should work fine. The only reason why the mark on the balancers would be different would be because the new one is defective or incorrect, or the old one is worn out enough that the timing mark has moved. If you need some help making sure that the timing is good, consider using YourMechanic, as a certified mechanic can come to you to [double check the valve timing on the engine] https://www.yourmechanic.com/services/timing-belt-replacement

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Car stuck in limp mode

It sounds like one of the shift solenoids is not functioning properly. I would recommend having a technician come out from YourMechanic and pull the codes on the computer, replace the shift solenoid, and change the transmission filter and fluid....

Q: Car stalls after starting

Hello - there are a number of issues that can cause stalling problems after your engine starts, or when you put it into gear. These include a dirty or malfunctioning idle air control valve, an air leak in the intake,...

Q: my 4runner has no power pulling hills?

Hi Marsha. Has the timing belt been recently serviced? If so, did the concern start after this service? The timing belt may be incorrectly set. However, if the timing belt has not been recently serviced there are other possible reasons...

Related articles

How Long Does a Heater Control Valve Last?
Keeping the right amount of coolant in a car is essential in keeping the engine at the right temperature. Failing to have the right amount of coolant or even bad elements...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...
P2103 OBD-II Trouble Code: Throttle Actuator Control Motor Circuit High
P2103 means there is a fault with the throttle actuator control motor circuit, likely due to a defective electrical component or part.