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Bmw 740I Engine Timing Chain Case Cover Gaskets

Bmw 740I Engine timing chain case cover gaskets

Starting at $24.95, AutoBuffy stocks 2 engine timing chain case cover gaskets from URO. This gasket seals the joint between the timing chain cover and the engine block, keeping oil inside and contaminants out. When it fails, oil leaks and contamination can accelerate timing chain wear, leading to costly engine damage if ignored.

Signs your Bmw 740I needs a new engine timing chain case cover gasket

  • Visible oil seeping or pooling at the front of the engine, often along the lower edge of the timing cover
  • Oil level drops consistently between changes with no other obvious external leak source
  • Burning oil smell from the engine bay as leaking oil contacts hot exhaust components nearby
  • Oil stains or residue on the harmonic balancer, crankshaft pulley, or front crossmember below the cover
  • Timing chain rattle or noise on cold start, which can indicate oil starvation caused by a persistent leak
  • Failed emissions or oil consumption test results pointing to front-of-engine oil loss

Which engine timing chain case cover gasket should you buy for your Bmw 740I?

The most important decision is material and construction — rubber-steel composites, multi-layer steel (MLS), and cork-rubber blends each handle heat cycles and clamping load differently. For most Bmw 740I owners, an OE-equivalent gasket from a reputable brand is the right call, but some applications benefit from upgraded materials when the original design had known failure points.

OE-Equivalent (rubber-steel composite)
Best for
Daily drivers, straightforward replacements
What you get
Direct-fit design matching original material and thickness; reliable seal with correct torque
Multi-Layer Steel (MLS)
Best for
High-heat engines or vehicles with a history of cover warping
What you get
Superior crush resistance and heat tolerance; less prone to blowout under thermal cycling
Cork-Rubber Blend
Best for
Older engines with slightly uneven or pitted sealing surfaces
What you get
Slightly compressible material that conforms to minor surface irregularities; good low-cost option
Full Timing Cover Gasket Kit
Best for
High-mileage engines or complete timing chain service
What you get
Includes cover gasket plus cam seals, crank seal, and related gaskets so all front-of-engine seals are replaced at once

Engine timing chain case cover gaskets brands we stock for your Bmw 740I

URO
2 options · from $24.95

Replacing the engine timing chain case cover gasket on a Bmw 740I

Advanced⏱ 3–6 hoursSocket and ratchet set (metric and standard)Harmonic balancer pullerTorque wrenchGasket scraper or razor bladeRTV silicone sealant (if required by gasket instructions)

Replacing this gasket requires removing the harmonic balancer, serpentine belt, and often the water pump, coolant, and several accessory brackets before the timing cover can be unbolted. All old gasket material must be fully removed and sealing surfaces cleaned before the new gasket is installed, as any residue will cause immediate oil leaks. Fasteners should be tightened in the sequence and to the specification listed in your vehicle's service manual, as uneven clamping is a leading cause of repeat failures.

Frequently asked questions

How much does it cost to replace engine timing chain case cover gaskets on a Bmw 740I?
The gasket itself starts at $24.95 at AutoBuffy. Total repair cost depends heavily on labor, since accessing the timing cover typically requires removing the harmonic balancer, accessory belt, and sometimes the water pump. Expect the part to be the smallest portion of the overall job if done at a shop.
Can I drive my Bmw 740I with a leaking timing chain case cover gasket?
Short distances may be possible, but it is not advisable. A leaking timing cover gasket causes progressive oil loss. If oil reaches the serpentine belt or drops low enough to starve the timing chain of lubrication, you risk belt slippage, chain wear, or sudden engine damage — all far more expensive than the gasket repair itself.
How long does a timing chain case cover gasket last on a Bmw 740I?
Most timing cover gaskets last well into the vehicle's high-mileage years, often the life of the engine under normal conditions. Premature failure is usually caused by overheating events that warp the cover, improper torque during a previous repair, or inferior gasket material used in an earlier replacement.
Do I need to replace the crankshaft seal when replacing the timing cover gasket on a Bmw 740I?
Yes, in almost every case. The crankshaft front seal is located in or adjacent to the timing cover and becomes accessible during this repair. Replacing it at the same time adds minimal cost and prevents having to pull the cover again shortly after. Most quality gasket kits include it for this reason.
Does the timing chain case cover gasket need sealant on a Bmw 740I?
It depends on the gasket type and the specific engine. Some rubber-steel gaskets are fully self-sealing and require no additional RTV. Others, especially at corner joints where the cover meets the oil pan rail, benefit from a small dab of RTV sealant. Always follow the gasket manufacturer's instructions included with the part.
Is a timing chain case cover gasket the same as a timing cover gasket on a Bmw 740I?
Yes, the terms refer to the same component. 'Timing chain case cover gasket' is the more precise name used when the engine uses a chain rather than a belt. 'Timing cover gasket' is the common shorthand. Both describe the seal between the front timing cover and the engine block's mating surface.

Shop engine timing chain case cover gaskets by year for the Bmw 740I

20012000199919981997

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Engine timing chain case cover gaskets for other Bmw models

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