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Workhorse Custom Chassis W62 Engine Rear Main Seal Covers

Workhorse Custom Chassis W62 Engine rear main seal covers

Engine rear main seal covers for the Workhorse Custom Chassis W62 start at low prices. We stock multiple options from top OE-quality brands. This cover seals and protects the rear main crankshaft seal, keeping oil from leaking at the back of the engine block. A cracked or warped cover lets oil escape onto the bell housing and clutch, leading to costly downstream damage if ignored.

Signs your Workhorse Custom Chassis W62 needs a new engine rear main seal cover

  • Persistent oil puddle forming directly beneath the rear of the engine, toward the transmission bell housing
  • Visible oil film or wet residue coating the flywheel or flexplate when inspected from underneath
  • Burning oil smell from the undercarriage after driving, caused by oil dripping onto hot exhaust components
  • Clutch slippage on manual-transmission models due to oil contaminating the clutch disc
  • Rapid or unexplained drop in engine oil level with no visible leak at the valve cover or oil pan
  • Cracks, warping, or a stripped bolt bore visible on the cover itself during a rear engine inspection

Which engine rear main seal cover should you buy for your Workhorse Custom Chassis W62?

The primary decision is material and whether the replacement cover includes a new seal pre-installed. OEM-spec aluminum covers resist warping and mate cleanly to the machined block surface, while some aftermarket options come as a kit with a seal already pressed in, saving a separate step. Confirm the bolt pattern and dowel-pin configuration matches your exact engine code before ordering.

OEM-replacement (bare cover)
Best for
Restoring factory fit on a high-mileage engine; reusing a serviceable seal
What you get
Precision-cast aluminum or stamped steel housing machined to factory tolerances; no seal included
Aftermarket cover with seal kit
Best for
One-purchase convenience; avoiding a separate seal sourcing step
What you get
Cover plus a pre-fitted or bundled rear main seal, sometimes with gasket and RTV included
Remanufactured cover
Best for
Budget-conscious builds where the original design had no known flaws
What you get
Cleaned and resurfaced used core, inspected for cracks; lower cost but verify flatness spec
Performance / billet aluminum cover
Best for
High-output or forced-induction builds needing extra rigidity under heat cycles
What you get
CNC-machined thick-wall housing with improved oil drain-back; may require minor fitment adjustment

Replacing the engine rear main seal cover on a Workhorse Custom Chassis W62

Advanced⏱ 3–6 hoursTransmission jack or engine support fixtureSocket and ratchet set with extensionsTorque wrenchSeal driver or suitable mandrelGasket scraper and cleaning solvent

Replacing the rear main seal cover on a Workhorse Custom Chassis W62 requires either dropping the transmission to access the rear of the block or, on some platforms, removing the engine entirely — making this an advanced job best suited to experienced DIYers with proper lifting equipment. Once the flywheel or flexplate is removed, the old cover unbolts, the mating surface is cleaned thoroughly, and the new cover is installed with a fresh seal and the correct gasket or RTV bead. Fasteners should be tightened progressively in a crossing pattern to the manufacturer's specified range to ensure even sealing without distorting the cover.

Frequently asked questions

How much does it cost to replace engine rear main seal covers on a Workhorse Custom Chassis W62?
The cover itself starts at low prices on AutoBuffy. Total repair cost depends on whether you also replace the rear main seal, gasket, and flywheel bolts at the same time — which is strongly recommended since labor to access this area is the same either way. DIY keeps costs close to parts only; shop labor adds significantly.
Can I replace just the rear main seal cover without replacing the seal on my Workhorse Custom Chassis W62?
Yes, if the existing seal is undamaged and within service life. However, because reaching this area requires dropping the transmission or removing the engine, most technicians replace both the cover and the seal together. Skipping the seal when it shows any wear risks repeating the same labor job in short order.
Is a leaking rear main seal cover the same as a leaking rear main seal on a Workhorse Custom Chassis W62?
No. The cover houses and retains the rear main seal, but each can fail independently. A warped or cracked cover will leak even with a perfect seal inside it. Proper diagnosis — tracing dye under UV light or cleaning the area and watching where oil reappears — identifies which component is actually the source.
Does a damaged rear main seal cover on a Workhorse Custom Chassis W62 cause clutch damage?
Yes, on manual-transmission models it can. Oil seeping past the cover can reach the flywheel and saturate the clutch disc, causing slippage, shuddering, and premature clutch failure. If the clutch shows contamination, it typically must be replaced along with the cover and seal to restore reliable operation.
What gasket or sealant should I use when installing a rear main seal cover on a Workhorse Custom Chassis W62?
Most Workhorse Custom Chassis W62 applications use either a formed rubber gasket or a bead of high-temperature RTV silicone — confirm which method your engine calls for before starting. Using RTV on a surface designed for a gasket (or vice versa) can cause improper compression and renewed leaks. Follow the cover manufacturer's included instructions for correct sealing method.
How long does a rear main seal cover last on a Workhorse Custom Chassis W62?
A quality aluminum cover can outlast the engine if undisturbed. Covers typically fail from physical damage during transmission removal, corrosion in high-salt environments, or warping from severe overheating events. Routine oil changes and keeping coolant in spec are the best ways to avoid the heat cycles that accelerate cover distortion.

More parts for your Workhorse Custom Chassis W62

Radiator Coolant HoseAccessory Drive Belt Tensioner AssemblyExhaust Flange Stud and NutEngine Water PumpAccessory Drive Belt PulleyEngine Oil FilterEngine Camshaft Position Sensor ConnectorEngine Crankshaft Position Sensor

Engine rear main seal covers for other Workhorse Custom Chassis models

Workhorse Custom Chassis P42Workhorse Custom Chassis W42