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non interferance


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20 replies to this topic

#1 Midwst

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Posted 19 July 2005 - 01:11 PM

are all 2.2 engines non interferance? Thanks

#2 grossgary

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Posted 19 July 2005 - 01:33 PM

no they are not. pre 1997 are non-interference. 1997 and above are interference.

i got this information from a subaru dealer mechanic who's been there for a number of years. he said he has seen some people bring in 2.2 liter motors with broken timing belts and has yet to see any of them that resulted in any damaged. he said the 2.5 motors routinely cause internal damage though.

#3 rweddy

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Posted 19 July 2005 - 03:20 PM

no they are not. pre 1997 are non-interference. 1997 and above are interference.

i got this information from a subaru dealer mechanic who's been there for a number of years. he said he has seen some people bring in 2.2 liter motors with broken timing belts and has yet to see any of them that resulted in any damaged. he said the 2.5 motors routinely cause internal damage though.


I thought all 2.2 were non-interference???
So is my 96 2.2 Legacy Outback is non-interference, right? :-\

#4 tcspeer

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Posted 19 July 2005 - 11:13 PM

I know from experence 1997 2.2 are interferance. My idle pully came apart at 288,000 miles and it bent the valves in three of the four cyclinders. The reason they are inteferance in 1997 is because the piston was coned up to get more compression or horsepower. I seen an article about this on this board or the other Subaru board.

#5 Andyjo

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Posted 19 July 2005 - 11:27 PM

what does interferance/non-interferance mean? :confused:

#6 tcspeer

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Posted 19 July 2005 - 11:35 PM

Non interferance means the valves and piston will not hit if timing belt breaks or something else goes wrong. Interferance means they might, so it is much more important to keep your belts changed at the right time on them.

#7 ~01~Outback

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Posted 19 July 2005 - 11:44 PM

Edit - was writing my reply when tcspeer posted! :)

My understanding is limited but here goes -

Interference is refering to the valves and the pistons - i.e. the pistons hitting the valves!

This issues arises when the timing belt breaks, slips off or generally fails for what ever reason! A non-interference engines set up, doesnt allow the valves & pistons to collide when the belt fails (dont ask me how!?); an interference engine does not have this, and can result in valves staying open while the pistions continue to pump (generally causing damage to the pistons, valves, and ive seen a very bent conrod from a Ducati race engine that lunched itself at 9500rpm and pounded the valves into spagetti...ala interfered with hehe)! Hope this is right!

Im surprised Subi went from non-inter, back to interference in 1997!! Anyone got any insight into this??

Is my 2001 EJ2.5 non-interference?? Hope so!!

Cheers
Scott

#8 kingbobdole

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Posted 20 July 2005 - 01:48 AM

Usually non interferance has valve reliefs cut into the tops of the pistons. This creates a area that can consume compression and restrain powA!
Anything 97 and newer will much the valves, so watch that maintance. You may think thats crappy, but its actually the way of things now a days, most companies do this. They just assume that you are not gonna own it forever and junk it if it gets to that point. The recxommended life of the T-belt is 60k or so, and I ve seen them go less but mostly without leaks and belt damage and stuff, they can go for MUCH longer... over twice that... Dont ask me how I know, I just do.:-\

#9 Setright

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Posted 20 July 2005 - 06:18 AM

When designing an engine, I reckon air flow around the valves, into the combustion chamber and around the piston crown plays a bigger role than snapped timing belts.

#10 blitz

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Posted 20 July 2005 - 09:56 AM

After reading numerous stories about folks changing out their timing belt at 100k miles, only to ultimately lose the engine at 130k due to a failed idler/ tensioner bearing, I made it a point to replace all the idlers on mine.

Ironically, the biggest obstacle I encountered was the personel at the dealership from where I purchased the parts, chiding me for doing it.

There are only two possibilities here:

1. They are ignorant of the facts.

2. Allowing me to blow my motor by feeding me disinformation would give them an opportunity to make a profit on me because I'm ignorant of facts.

It doesn't matter which answer is correct. The bottom line is that THE AUTHORIZED DEALER for the product is incapable of providing correct, factual information about something basic. If anything will get me pissed-off, that's about at the top of the list.

While I'm in the rant mode, I'll add: Any certified mechanic that adds STOP LEAK to a car as the procedure to repair a head gasket, should have his/her certification revoked. The certification process was instituted to put an end to shadetree practice. Further any dealer that doesn't actively oppose (band together with ALL OTHER DEALERS) the practice should probably think about selling the business to someone that cares about customer service, honhesty and integrity. Why should I shed a tear for the poor dealer when it's ME that's getting screwed? Rant: OFF.

#11 cookie

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Posted 20 July 2005 - 11:02 AM

I stopped going to my local Subaru dealer when they did a clutch job for me and did not replace the pilot bearing. This failed a year later costing me bucks. The mechanic who was assigned the job rode with me to demonstrate why I thought it was the pilot bearing. He felt just as I did that anytime you do a clutch you replace the $10 part.
My dealer has around 10 mechanics with varying levels of skill and different therories of car repair.
I also had the water pump and tensioner replaced as well as all the seals etc on my Forester. I hope the front of the engine will not need to be opened for another 90,000 miles.

#12 blitz

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Posted 20 July 2005 - 12:21 PM

Cookie, that reminds me to express my gratitude to those who created and maintain this forum, as well as all the contributing members here.

This is one of the most informative & better-tempermented forums on the net.

I had important questions come up in the middle of the big, front-end service I did on my motor several months back, but the all knowledgable folks here walked me right through it.

See, I'm not really as curmudgeonly as I might seem. :-\ :D

#13 cookie

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Posted 20 July 2005 - 12:30 PM

inventor anyway Blitz. I would also like to express my gratitude to the folks who do all the real work here.
This forum has taught me all the limited knowlede of Subarus that I have now, as well as given me advice to buy a phase 2 in the first place.
Frankly no other car I know needs the oil pump resealed or that plastic slinger plate replaced. That is the kind of thing that can save you money later if you know to have it done at the right time.
Where else can you find pages on how to fix a clock?

#14 dpoppeli

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Posted 20 July 2005 - 01:01 PM

I owned a Chrysler minivan which went through quite a few idler pulleys, and weee.. there goes the serpentine. I also lost the belt on the same van once when I went through a large puddle. Don't have a Subaru engine in front of me but do the 2.5's really have a tensioner on the timing belt??

Also, anyone know if the o&m manual have a replacement interval for any tensioners?


After reading numerous stories about folks changing out their timing belt at 100k miles, only to ultimately lose the engine at 130k due to a failed idler/ tensioner bearing, I made it a point to replace all the idlers on mine.

Ironically, the biggest obstacle I encountered was the personel at the dealership from where I purchased the parts, chiding me for doing it.

There are only two possibilities here:

1. They are ignorant of the facts.

2. Allowing me to blow my motor by feeding me disinformation would give them an opportunity to make a profit on me because I'm ignorant of facts.

It doesn't matter which answer is correct. The bottom line is that THE AUTHORIZED DEALER for the product is incapable of providing correct, factual information about something basic. If anything will get me pissed-off, that's about at the top of the list.

While I'm in the rant mode, I'll add: Any certified mechanic that adds STOP LEAK to a car as the procedure to repair a head gasket, should have his/her certification revoked. The certification process was instituted to put an end to shadetree practice. Further any dealer that doesn't actively oppose (band together with ALL OTHER DEALERS) the practice should probably think about selling the business to someone that cares about customer service, honhesty and integrity. Why should I shed a tear for the poor dealer when it's ME that's getting screwed? Rant: OFF.



#15 Tiny Clark

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Posted 20 July 2005 - 01:12 PM

Subies use a hydraulic tensioner. If it is a son-of-a-beast to compress, it's still good.

#16 Midwst

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Posted 20 July 2005 - 03:21 PM

Do all subarus use a hydrolic tensioner?

#17 NorthWet

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Posted 20 July 2005 - 03:25 PM

Do all subarus use a hydrolic tensioner?

Not the pre-EJs. (But this IS a New-Gen Forum...)

#18 blitz

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Posted 20 July 2005 - 04:45 PM

I sort of expect you to be a bit like a mad inventor anyway Blitz

I kinda like to think of myself as the professor from Gilligan's Island. :headbang:

#19 ~01~Outback

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Posted 20 July 2005 - 05:33 PM

Reading this thread, being new to Subis and casually reading this forum over the last few months - ive got to wondering if there is a quick reference point for individual engine/model combinations that isnt covered by Subaru maintenance (eg the idler/tensioner bearing!?)? If not ill start another thread for this point! -

Any thoughts!?

Scott

#20 blitz

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Posted 20 July 2005 - 07:41 PM

Scott, do you mean like sticky threads for individual engines and stuff?

I don't think so, but the search function works pretty good if you feed it the right keywords and spend some patient time with it.

#21 ~01~Outback

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Posted 20 July 2005 - 08:05 PM

Scott, do you mean like sticky threads for individual engines and stuff?

I don't think so, but the search function works pretty good if you feed it the right keywords and spend some patient time with it.


Yep thats what im getting at!!
Ive not had much joy with the search function yet!

What im thinking is to post a thread for my engine and simply add to the initial post - hopefully this sort of thing can become a sticky thread (as you mention). this would help reduce multiple postings re the same questions! Ill give it a go, and see!
Cheers




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