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Old 02-07-2007, 10:28 PM   #1
greenhand
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1998 Impreza 2.5 RS
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Question 1998 2.5RS Headgasket Repair...What else?

Has 141,000 on it. I'm going to do the repair myself, what parts should I replace while I'm in there? What should my shopping list look like?

1. Subaru Overhaul Gasket Set
2. Timing Belt?
3. Water Pump?
4.?

If anyone has experience or useful advise, I'd greatly appreciate it.

Thanks Again,

Seth
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Old 02-07-2007, 10:49 PM   #2
shaggie
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a good calibrated torque wrench
and a service manual.
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Old 02-07-2007, 11:01 PM   #3
kwh29
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I'm in process of doing the same, and already have the manual and tq wrench. Any suggestions on things I should do? I've got a shop freshening the heads and am going to replace the knock sensor as well just for security, since the compression ratio will bump up a touch.

Probably also going to replace the idler pulleys and timing belt - the water pump was replaced fairly recently. The clutch and PP are almost new too.

Can anyone suggest something else? I was considering bypassing the water heating on the throttle body when I put it back together. Any pros/cons on that?

--Kevin H.
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Old 02-07-2007, 11:23 PM   #4
redwagon
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Delta reground cams!
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Old 02-08-2007, 10:05 AM   #5
8Complex

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Depends what else has been done at that mileage. I would expect a timing belt and maybe water pump to be up there if it hasn't been done in the last half of the cars' life. More than likely a good check over the rest of the hoses/wiring to see if anything is degrading, and possibly even a coolant/radiator flush.
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Old 02-08-2007, 10:47 AM   #6
Mike1967
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If you are sending the heads into a machine shop then I would recommend getting a valve job done. Cost should be under $200.00 for resurfacing and replacing the oil seals....and they will also check the springs, seats, valves, guides etc. to insure everything is working properly.


remove the oilpump and check the backing plate for loose screws.
Replace the oilpump O-Ring
Possibly a new tensioner if it has never been replaced.
Replace the rear plastic plate (oil separator plate) with aluminum plate
Set the Valve Lash on all 16 rockers (after you put the timing belt back on.)

Since you are already buying the head gaskets....you might want to consider buying the overhaul gasket set if have not recently already replaced the rear main seal and oil pump O-Ring.

IF you buy the overhaul gasket set then:

Front Crank Seal
CAM Seals
REAR MAIN SEAL
Valve Cover gaskets
Front cover gasket
(And many other misc seals/gaskets)
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Old 02-08-2007, 10:48 AM   #7
Calamity Jesus
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Don't forget the multi-faceted head bolt socket. Anybody know what it's called?
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Old 02-08-2007, 02:23 PM   #8
8Complex

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Quote:
Originally Posted by Beaverboy View Post
Don't forget the multi-faceted head bolt socket. Anybody know what it's called?
The 12 point socket that is for a 14mm hex?
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Old 02-08-2007, 03:12 PM   #9
Patrick Olsen
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Idler pulleys and knock sensor seem like kind of random things to replace. I guess it can't hurt to replace either of them, it just seems like two things that really don't need to be on one's preventive maintenance list. I don't think I've ever seen anyone here complaining about an idler pulley seizing up on them - mine are rollin' smooth as silk after 180,000 miles. And the knock sensor really doesn't break or degrade, so if you don't have a knock sensor CEL then replacing it isn't going to do anything but burn $80.

Pat Olsen
'97 Legacy 2.5GT sedan
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Old 02-08-2007, 10:12 PM   #10
kwh29
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All the idlers seem a bit gronky and noisy. Most of the front of the engine stuff was replaced about 20k miles ago by the previous owner, although I think he kept the original idlers. The water pump was replaced then too and it _definitely_ spins smooth as silk.

Thanks for the reminder on the hoses - the heater hoses are really nasty, definitely need to add those to the list.

I've got a shop doing the head now - I'm having them pressure test, do the valve seats, put in new valve guides and seals, and slightly deck the heads if there is any warpage. Hopefully there won't be any bent/burned valves or head cracks...

--Kevin H.
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