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21561640 | Mack MP8/Volvo D13 Idler Pulley, New

Pricing: $346.01

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When it comes to idler pulleys, why risk your engine?

Don’t let a small part turn into a major repair. We wouldn't risk putting sub-par parts into our engines, so why should you?

HHP only sells idler pulleys that are manufactured in a state of the art facility using top of the line machining and measuring equipment to ensure each part is manufactured to OEM specifications. Combine this with up to 50% off OEM prices, an industry leading 2-year warranty and technical expertise from HHP’s certified staff, and you’ve got a quality idler pulley that will keep you running for another million miles.

Need a little extra proof? Let's talk shop.

  • Your Idler Pulley is brand new, ensuring you get the longest life possible out of it.

  • In order to maintain quality and consistency this pulley was manufactured in an ISO 9001 certified facility

  • This idler pulley is designed to OE specifications and offered at a much lower price.


  • (1) Idler Pulley


2-Year Unlimited Mileage Warranty
Warranty acceptance/denial will be at the sole discreation of each respected manufacturer. Each of HHP's manufacturers utilizes their own warranty procedures which vary in claim review time (typically between 3-5 weeks). On items that carry a labor warranty, rates are paid on flat-rate book time. Rates vary by manufacturer.
OEM Applications:
  • 21561640

Technical Data

Mack 8:
Torque Specs:
Intake Manifold: 15-21 FT/LBS
Exhaust Manifold: 35 FT/LBS
Flywheel: 40-48 FT/LBS, + 120°
Damper: 22-30 FT/LBS, 59-73 FT/LBS
Main Bearing Cap: 96-126 FT/LBS, + 120°
Connecting Rod: 13-17 FT/LBS, 42-46 FT/LBS, + 90°
Cyl Head: 70-78 FT/LBS, REPEAT 70-78 FT/LBS, + 120°, + 90°

Tune-up Specs:
Compression Ratio: 16:1
Firing Order: 1-5-3-6-2-4
Oil Pressure At Idle: 37 PSI MIN @ 600 RPM, 44-80 PSI @ 1200 RPM
Intake Valve Lash: .008" COLD
Exhaust Valve Lash: .031" COLD

Volvo D13:
Torque Specs:
Intake Manifold: 15-21 FT/LBS, M10 PLUG 13-17 FT/LBS
Exhaust Manifold: 34-38 FT/LBS
Flywheel: 41-48 FT/LBS, + 110-130°
Damper: 22-30, 59-74 FT/LBS (DO NOT REUSE 8.8 BOLTS)
Main Bearing Cap: 96-125 FT/LBS, +115-125°
Connecting Rod: 13-17, 42-46 FT/LBS, +85-95°
Cyl Head: 70-76 FT/LBS + 120° + 90°

Tune-up Specs:
Compression Ratio: 16.0:1
Firing Order: 1-5-3-6-2-4
Oil Pressure At Idle: 29 PSI MIN @ IDLE, 44-80 PSI ABOVE 1400 RPM
Intake Valve Lash: .008" COLD
Exhaust Valve Lash: .0315" COLD (.800 MM)
Lash Adjustment Method: ADJUSTING SCREW


  • P252958
  • P252958
  • HHP
  • New

Shipping Information

  • Item Requires Shipping
  • 6.6 lbs.

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