maintenance questions

[mbjj]

Is the 2.2 engine zero tolerance? What would be the damage if the timing
belt broke while at speed? I have a 92 Legacy and I've heard both that it
is and isn't zero tolerance. Right now I have it down for maintenance for
the belt but it'll be a project just to get to it. I'm just curious.
thanks

 

[David & Caroline]

I think you mean interference vs. non-interference engine - in the former,
if the piston were at it's highest position, it would hit the valves if they
were open - in a non-interference engine, they would not - so if you have a
non-interference engine, and the timing belt snaps, the car just coasts to a
stop - install a new belt and you are good to go. In an interference
engine, however, if the timing belt snaps, the pistons will hit the valves -
this will generally result in a bunch of bent valves, along with potentially
damaging one or both of the heads as well (not good).

for the Subaru 2.2L, this website
(http://www.ourautoshop.com/TBeltChart.html) says the 2.2L is
non-interference

However - another site
(http://library.motoralldata.com/techRef/WebHelp/Timing_Belt_Subaru.htm)
says that the SOHC version is non-interference, but the DOHC version of the
2.2L is an interference engine.

 

[Carl 1 Lucky Texan]

Ths SOHC 2.2l engine is usually refered to as non-interference.
Emily at http://www.ccrengines.com/ claims there are soob engines that
hit piston-valve. Not sure which ones they are.
From what I've read, ALL the DOHC engines can hit valve-valve.(due to
the angle at which they protrude.)
Carl
1 Lucky Texan

 

[Edward Hayes]

According to Subaru.com email: ALL 2.5L engines are INTERFERENCE type. I
suggest you go to the source ( www.subaru.com) to get an answer. eddie

 

[Stu Hedith]

That's incorrect. The DOHC 2.5 available in 1998 was definitely
INTERFERENCE. However, the SOHC 2.5 available in 1999 was definitely
NON-INTERFERENCE.

Stu

According to Subaru.com email: ALL 2.5L engines are INTERFERENCE type. I
suggest you go to the source ( www.subaru.com) to get an answer. eddie

Ths SOHC 2.2l engine is usually refered to as non-interference.
Emily at http://www.ccrengines.com/ claims there are soob engines that
hit piston-valve. Not sure which ones they are.
From what I've read, ALL the DOHC engines can hit valve-valve.(due to
the angle at which they protrude.)
Carl
1 Lucky Texan


former,

they

have a

to a

valves -

 

[Edward Hayes]

You are wrong Stu. Subaru tech. dept. says "ALL 2.5L ENGINES ARE OF THE
INTERFERENCE TYPE" The valve angle (intake & exhaust) are at the same angle
on the SOHC & DOHC. The SOHC engine uses rocker arms whose length
compensates for the second cam. eddie

That's incorrect. The DOHC 2.5 available in 1998 was definitely
INTERFERENCE. However, the SOHC 2.5 available in 1999 was definitely
NON-INTERFERENCE.

Stu