488-3493 rear camshaft CAT engine spare part

Advantages

• Controls the timing of exhaust valves.
• Smooth surface finish for reduced friction.
• Withstand high rotational speeds and loads.
• Operates in synchronization with pistons.

1. Exclusive mounting datum at cylinder block rear, different cam profile from front camshaft for accurate timing phase
2. Mirror ground cam surface with low friction, reduces oil temperature rise and wear rate
3. Uniform hardened layer, no easy softening under sustained high temperature, excellent cam durability
4. Tight coaxiality control of journals, prevents eccentric bearing wear and protects cylinder block bearing housing

FAQ 

Q1：Can 488-3493 be directly replaced with 20R-6743?
A：Yes, they are cross-reference parts with identical dimension and cam profile.
Q2：Should cam bearings in cylinder block be replaced together with this camshaft?
A：Replacement is recommended. Worn old bearings will cause rapid wear on new camshaft.
Q3：What causes intermittent knocking noise from camshaft?
A：It is usually caused by bearing wear, stuck tappets or timing misalignment, valve train disassembly inspection is needed.
Q4：How often should we recheck valve clearance after camshaft installation?
A：Recheck within 50 working hours after overhaul, then follow regular service interval.