4W-9985 86-tooth camshaft gear for engine spare part

Product Advantages

1. OEM tooth profile design ensures uniform meshing clearance, smooth transmission and reduces noise and impact wear.
2. Deep carburizing heat treatment delivers high tooth surface hardness and resists pitting and tooth breakage under cyclic shock load.
3. Precision machined bore and locating holes provide good coaxiality, minimizing camshaft runout and protecting bearings.
4. Built-in timing marks match OEM reference, no extra ratio calculation required during overhaul timing alignment.

FAQ 

Q: Can 4W-9985 be fitted directly to 3412 engine?
A: No. 3412 timing gear has different tooth count and tooth profile, transmission ratio does not match, interchange is invalid.

Q: Can a gear with minor pitting on teeth be installed for continued use?
A: Continued use is not recommended. Pitting will propagate rapidly under mining heavy load and lead to tooth fracture, causing secondary damage to camshaft and valves.

Q: Is timing recalibration mandatory after replacing the camshaft gear?
A: Yes. Alignment must follow the timing marks on gear and crankshaft. Timing deviation causes power loss and valve damage.