2005 STI - Timing Belt Job - What else to replace?

oreganobag · 10-02-2020, 12:55 PM

Buying a used STI at 90k miles that needs the timing belt replaced. I've bought the Aisin kit that includes the waterpump and bought an OEM thermostat and gasket and coolant.

I also bought new NGK Irridium spark plugs.

Is there anything else I should pre-emptively have done while it is in the shop to lower costs and have them all done at the same time? Headgaskets maybe? OEM or aftermarket? I plan on keeping the car under 350 HP and really only doing reliability/driveability mods.

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DrD · 10-04-2020, 12:56 AM

The other belts you remove (alternator and AC) since they are coming off, anyway. I'd leave the crank and cam seals alone unless you have a leak. At that age, I'd think about replacing the upper/lower radiator hoses, as well. If you bought the plugs off ebay or amazon, make sure they are not counterfeit (it's been a big issue)

600hpSTI · 12-02-2020, 03:11 PM

Have the TB, water pump, and boost lines (known to corrode and cause boost leaks) checked and/or replaced

10-02-2020, 12:55 PM	#1
oreganobag Scooby Newbie Member#: 518019 Join Date: Aug 2020	2005 STI - Timing Belt Job - What else to replace? Buying a used STI at 90k miles that needs the timing belt replaced. I've bought the Aisin kit that includes the waterpump and bought an OEM thermostat and gasket and coolant. I also bought new NGK Irridium spark plugs. Is there anything else I should pre-emptively have done while it is in the shop to lower costs and have them all done at the same time? Headgaskets maybe? OEM or aftermarket? I plan on keeping the car under 350 HP and really only doing reliability/driveability mods. * Registered users of the site do not see these ads.

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10-04-2020, 12:56 AM	#2
DrD Scooby Guru Member#: 22412 Join Date: Aug 2002 Chapter/Region: SWIC Location: Albuquerque, NM Vehicle: 2012 Legacy 2.5GT Ice Silver Metallic	The other belts you remove (alternator and AC) since they are coming off, anyway. I'd leave the crank and cam seals alone unless you have a leak. At that age, I'd think about replacing the upper/lower radiator hoses, as well. If you bought the plugs off ebay or amazon, make sure they are not counterfeit (it's been a big issue)

12-02-2020, 03:11 PM	#3
600hpSTI Scooby Newbie Member#: 520674 Join Date: Dec 2020 Chapter/Region: SCIC Location: CA Vehicle: 2008 WRX STI Hatch Hyper Blue	Have the TB, water pump, and boost lines (known to corrode and cause boost leaks) checked and/or replaced