BMW Internal Engine Parts for BMW 3 Series E46 (1999-2005)

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Rebuilding your engine or giving your cylinder head an overhaul? Internal engine components covers parts that are located within the engine block and cylinder head. Examples include: timing chains and tensioners, rocker arms, rod bolts and studs, head bolts, valve springs, connecting rods, and more. These are Genuine BMW engine parts, performance upgrades, or approved aftermarket brands that have a long track record of reliability and quality.

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Bremmen Camshaft Position Sensor - E46 E39 E60 E83 Z3 Z4
Bremmen Camshaft Position Sensor - E46 E39 E60 E83 Z3 Z4
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Bremmen Parts - Corporate Logo
T#:640145
Part#: 12147518628
Ships on Dec 16, 2026
Sale - Save 20% $ 32.99

This product was last offered at the strikethrough price on
11-07-2026

$ 26.39 USD
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Sale - Save 20%
$ 32.99

This product was last offered at the strikethrough price on
11-07-2026

$ 26.39 USD
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A bad cam sensor can cause a variety of problems from hard starting to stalling at low speeds. Cam sensor replacement has been known to cure many drivability issues
Rein M50 M52 Piston Ring Set - Priced Each - 11251437077 - E36, E46, E34, E39
Rein M50 M52 Piston Ring Set - Priced Each - 11251437077 - E36, E46, ...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:379819
Part#: 11251437077
Ships in 3 Business Days
$ 31.99 USD
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$ 31.99 USD
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Standard bore replacement piston rings
Rein Exhaust Valve - E34, E36, E39, E46, Z3
Rein Exhaust Valve - E34, E36, E39, E46, Z3
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Rein - Corporate Logo
T#:379738
Part#: 11341739823
Ships on Nov 30, 2026
$ 20.99 USD
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$ 20.99 USD
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Replacement exhaust valve
Rein M54 S54 O-Ring Seal - 12141748398 - E46, E39, E60, E83, E53
Rein M54 S54 O-Ring Seal - 12141748398 - E46, E39, E60, E83, E53 ...
Cam sensor - intake or exhaust side
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:12463
Part#: 12141748398
In Stock
$ 4.99

This product was last offered at the strikethrough price on
06-29-2026

$ 2.75 USD
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$ 2.75 USD
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This is the o-ring used for most BMW camshaft sensors and crankshaft sensors. Although most sensors that we sell come with this o-ring at no charge, they may be the source of oil or fluid leaks.
Rein M54 Piston Ring - Priced Per Piston - 11257506252 - E46, E39, E83, E53
Rein M54 Piston Ring - Priced Per Piston - 11257506252 - E46, E39, E8...
2X Entries Into Our F80 M3 Sweepstakes
Rein - Corporate Logo
T#:591606
Part#: 11257506252
Back Ordered
$ 53.99

This product was last offered at the strikethrough price on
10-28-2026

$ 48.99 USD
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$ 48.99 USD
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Piston Ring - Priced Per Piston | BMW M54 3.0L Engine is a vital component in maintaining proper compression and oil control in BMW M54 3.0L engines. Over time, piston rings experience wear from continuous movement within the cylinder bore, leading to decreased engine efficiency. Worn or damaged rings can result in excessive oil consumption, reduced performance, and visible black or blue smoke from the exhaust. Ideal for engine rebuilds, this high-quality replacement ensures optimal sealing and longevity.

  • Restores proper compression and oil control for improved engine performance
  • Reduces oil consumption and minimizes exhaust smoke
  • Direct-fit replacement for BMW M54 3.0L engine pistons
  • Manufactured from high-strength materials for durability and longevity
  • Essential for engine rebuilds and maintaining peak efficiency
  • Designed to withstand high temperatures and pressures for reliable operation
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Cat Cams M52TU B28 Turbo Conversion Camshaft Set
Cat Cams M52TU B28 Turbo Conversion Camshaft Set
Cat Cams - Corporate Logo
T#:25838979
Part#: 1304402
Special Order: No Guaranteed ETA
$ 1,642.99 USD
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$ 1,642.99 USD
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Oil Pump Chain
Oil Pump Chain
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Bremmen Parts - Corporate Logo
T#:26271802
Part#: 11417576915
In Stock
Sale - Save 30% $ 18.99

This product was last offered at the strikethrough price on
11-07-2026

$ 13.29 USD
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Sale - Save 30%
$ 18.99

This product was last offered at the strikethrough price on
11-07-2026

$ 13.29 USD
Free Shipping on orders $49 and up
Add to Wish List
Schrick Exhaust Camshaft - E46 M3, MZ3, MZ4 (S54) - 280 Degree, 14.0mm Lift
Schrick Exhaust Camshaft - E46 M3, MZ3, MZ4 (S54) - 280 Degree, 14.0m...
Schrick - Corporate Logo
T#:23847549
Part#: 0415A180001
Special Order: No Guaranteed ETA
$ 1,876.99 USD
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$ 1,876.99 USD
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