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Solid Lifter EJ22's--interference or no?
Posted 26 September 2003 - 07:10 PM
I'm just curious...I know that both EJ22 and EJ25 motors were converted to solid lifters by the time my 1998 Impreza was produced.
Did this design change make them into interference engines? I've seen information that shows the EJ25 is an interference engine, but the EJ22 isn't...but that was for the older hydro-head EJ22.
-Jon, worrying a bit about the possibly 75,000 mile-old timing belt...
Posted 26 September 2003 - 07:18 PM
Posted 27 September 2003 - 09:17 AM
If your date of manufacture was in '97 sometime, you should be ok.
Posted 27 September 2003 - 10:19 AM
Also, (again from reading and looking at drawings of engines) the interfderence engines have dual overhead cams (4 cams per engine) and this calls for a more acute valve angle such that they can hit each other under TB failure conditions. I've seen NO mention of lifter 'style' changing this fact. If you have 1 cam per 'side'. It's non-int.
1 Lucky Texan
Posted 27 September 2003 - 10:37 PM
Posted 28 September 2003 - 11:01 AM
So, is it the late 2. - wait...
OK, is the presence of solid/hydro lifters an indicator?
is there a LIST of EXACTLY which engines are NON-interferential?
1 Lucky Texan
Posted 01 October 2003 - 12:50 PM
My 2002 Forester (2.5 w/solid lifters) states in the service manual that there are Valve Depressions on the surface of the pistons to prevent interference in the event that the timing belt fails.
If I do my PM, as I have always done, and have a failure, as I did on my Legacy, now I'm uncertain as per the above comment which I should believe as they ARE in the engine business, as to the survival of the current 2.5L......:-\
Posted 02 October 2003 - 08:37 AM
Thank you for taking the time to contact us. Your 2002 Forester has an interference engine. Therefore, if the timing belt were to break, it would cause further damage to your vehicle. We recommend that the timing belt be inspected at every 30,000 mile service interval and replaced at the 105,000 mile service interval.
Thanks for the opportunity to be of assistance. If you need any future assistance, please feel free to contact us again.
Posted 02 October 2003 - 03:13 PM
This question always comes up.
1 Lucky Texan
Posted 02 October 2003 - 07:51 PM
Posted 02 October 2003 - 08:52 PM
I understand that even my M series BMW can blow the heck up if you select the wrong gear on a downshift.
I have changed valves on even tough stuff like a 534 International when a guy managed to select second instead of fith. (On the freeway no less.)
If one blew a downshift with a 2.2 do they ever tangle?
Posted 02 October 2003 - 09:21 PM
Posted 02 October 2003 - 11:40 PM
'90-96. Non-interferential, definitely.
'97 and 98 are a little fuzzy. Seems that somewhere in the late '97-98 MY there were changes, some of which we haven't seen yet. Late '98, if it looks like a 2.5 SOHC (only 2 timing covers on the front), extremely likely it's interferential. One of these is a 4 month only engine.
'99 EJ22 is definitely interferential. We've done 3 in the last couple of months. 1 year only engine.
All are interferential, no matter what year, both DOHC and SOHC.
It's valves that hit pistons. We have part of one piston that was hit so hard that the only thing remaining intact (sort of) is the head (flat side) and what's left of the ring landings. The head is actually in 3 pieces and is being held together by the rings which are "mostly" still in the grooves. The wrist pin was in the oil pan.
And the failure doesn't have to be as catastrophic as a broken timing belt or failed tensioner. If the belt is off by as much as 3 teeth, it can and most likely will cause valve/piston damage.
If I have ever "preached" maintenance and using Genuine OEM parts, I do it doubly for these engines! Change your oil and never, ever, under any circumstances let them overheat! Use the right octane of gas too. We see burnt exhaust valves in 3 out of 5 engine cores that were replaced for a different problem!
I'm sure Rick (the Master Rebuilder himself) could add to this.
Posted 03 October 2003 - 03:15 AM
Posted 03 October 2003 - 10:30 AM
But back on subject, it looks like from what you folks say we should have no fear of valve float on over revs.
By the way that old International I mentioned bent every single valve. With stellite valves that cost a fortune. No holes in those tough old forged pistons though.
I missed a shift on a 327 solid lifter Chevy once and put a pushrod hole through the valve cover.
From what I hear from you folks I will be changing my timing belt
like the pope changes his underwear.
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