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DIY: 1998 Volvo S70 Timing Belt Overhaul

Timing Belt, Water Pump, Cam Seals, Serpentine Belt… The Whole 9 Yards!

Timing belt and serpentine belt at 85k milesMy 1998 S70 with 150K had the TB and SB replaced at 65K (in 2004).

At 150K, these are my observations:

  1. The TB (Timing Belt) with 85K on it is still OK, has hairline cracks, but time to replace.
  2. The TB factory Idler and Tensioner Pulleys have slight play and were “free-wheeling”, so time to replace
  3. The WP has no leak, but the bearing has a very very slight play. Technically speaking, you can keep the WP for another 30K. From reading Ozark Lee’s and few others experience with leaking water pump at 150K or so, and since I have no time to redo this in 30K, I put in a new Aisin WP.
  4. Front Cam Seals have slight leak, no big leak, but since I am there, I may as well replace the Cam seals. It was quite an experience but no worry, I will show you the easy way. Read on…
  5. Since you will be removing the Cam Sprocket, make sure you read forum on the issue of Cam Sprocket Timing Advance vs Retard adjustment. Do not assume that your sprockets were correct (never know the P.O. adjusted the setting). However, if your cam sprockets are stock and have never been adjusted before, you can mark them for ease of re-installation. I adjusted my Exhaust to +3 degrees (Advanced) and Intake to -1 degrees (Retarded).
  6. The SB (Serpentine Belt) with 85K on it is still OK, has hairline cracks, but time to replace. I keep the old SB in the trunk as spare just in case.
  7. The SB factory Idler and Tensioner Pulleys have slight play and were “free-wheeling”, the grease dried out, and were somewhat noisy during operation, so time to replace them.
  8. The Alternator Front Pulley spins with little resistance, so the Front Bearing is probably somewhat worn, but I will do an Alternator overhaul later, maybe at 180K or so. For now, the Alternator is OK.

DIY: 1998 Volvo S70 Timing Belt, WP, Cam Seals, Serp. Belt

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