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Old 11-02-2005, 11:24 AM   #1
Hayes
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Default SOHC Timing belt

My Subaru dealer charges 5-600 dollars for a timing belt change and another 100 to add the water pump. What are others paying at their Subaru dealer? at an independent shop that services Subarus? Thanks Ed
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Old 11-02-2005, 11:01 PM   #2
Pakin
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I pay for parts and doo eet meself

I think $500 is just about right from my dealer. And independant shop might be cheaper, look around for some Subaru specific indie shops.

But really, I think it would be easy for you to do a timing belt, on SOHC as well.

-paK +1
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Old 12-08-2005, 06:13 AM   #3
xS2k
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Is the directions for sohc and dohc the same?
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Old 12-08-2005, 11:59 AM   #4
Hayes
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I just replaced my timing belt, water pump, coolant hoses, thermostate and belts for ~$164 using all OEM parts except for the water pump (New Bosch water pump at PEP-BOYs for $54.99 vs OEM at 94.99). The directions for the SOHC is different in one very important way. You MUST lock the DOHCs to keep them from turing when you remove the timing belt or you will damage the valves.
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Old 12-08-2005, 02:42 PM   #5
HndaTch627
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Quote:
Originally Posted by Hayes
I just replaced my timing belt, water pump, coolant hoses, thermostate and belts for ~$164 using all OEM parts except for the water pump (New Bosch water pump at PEP-BOYs for $54.99 vs OEM at 94.99). The directions for the SOHC is different in one very important way. You MUST lock the DOHCs to keep them from turing when you remove the timing belt or you will damage the valves.
having done a few DOHC belts you don't have to lock the cams, it helps but they will sit still if you are careful
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Old 12-08-2005, 04:44 PM   #6
xS2k
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So for SOHC cars, you don't have to worry about locking the cams? Just want to make sure before I bust out the wrenches...thanks

I did timing belts for hondas, how difficult do they compare?
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Old 12-08-2005, 08:04 PM   #7
Hayes
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To xS2k: You do not need to lock the cams on the SOHC engine but, you should/must turn the engine over until ALL the alignment marks are lined up. It is foolish to not lock the cams on the DOHC engine as if one of the cams turn ( and they usually do) you will damage the valves. Subaru makes a special tool for the DOHC engine but, others on this NG have made one that works. JMHO Ed
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Old 12-09-2005, 12:28 AM   #8
Pakin
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Quote:
Originally Posted by Hayes
It is foolish to not lock the cams on the DOHC engine as if one of the cams turn ( and they usually do) you will damage the valves.
I just don't see how valves can be damaged if one (or two) cams suddenly unload.

I've done more timing belt changes than I can count on various DOHC engines (Phase I EJ253, EJ205, etc.), and I have not had a problem on any of them, since I've never locked my cams except to tighten a sprocket bolt or if I'm working in a dark spot and it's hard to align the belt to the markings. And they've unloaded unintentionally before, no damage whatsoever.

-paK +1
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Old 12-09-2005, 03:52 AM   #9
xS2k
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Quote:
Originally Posted by Hayes
To xS2k: You do not need to lock the cams on the SOHC engine but, you should/must turn the engine over until ALL the alignment marks are lined up. It is foolish to not lock the cams on the DOHC engine as if one of the cams turn ( and they usually do) you will damage the valves. Subaru makes a special tool for the DOHC engine but, others on this NG have made one that works. JMHO Ed
Thanks, my car will be hitting 105k soon, so I'll be putting in an order very soon
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Old 12-09-2005, 11:52 AM   #10
Hayes
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The valves can be bent on the DOHC 2.5 L engine because the intake & exhaust valves enter the same space when open. The valve timing is what keeps them from hiting one another. So if you rotate one cam with respect to the other you can bend valves. Since there is valve springs on each valve, the spring can force the cam to turn if not locked.
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Old 12-09-2005, 01:38 PM   #11
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The issue is the speed and force.

At 3000rpm with the engine running if they collide it can do damage.

If it's just sitting there and the springs unload and snap them back, probably not. They might collide, just not hard enough to damage them.
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Old 12-09-2005, 05:47 PM   #12
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The driver's side cam on a 2.2 SOHC is under tension when aligned with the timing mark. I assume the same for the 2.5 SOHC. While changing my Timing Belt I had the cam sprocket resting on the marks while putting the belt on and the cam sprocket on the driver's side decided it didn't want stay put any longer. It spun about 1/3 of a turn before it came to smacking halt, hence, infererence. All was okay, thankfully, but I would avoid this if possible.

-Charles-
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