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EJ251 SOHC Timing


 

I went to do a timing belt change for the first time since conversion and got to setting TDC before removing the old belt. I noticed that the timing mark on the crank sprocket appears to be off by one tooth while the cams seem to be perfectly aligned. The van was running well. How is this possible?? Another observation I made was that the belt guide is not in place. This conversion was done by RMW so I was surprised to not see the guide. Donor car VIN lists MT so it should have been there, no?
?
Thanks in advance for any insight.??
?
?
?


 

tooh off - install error? skipped due to no guard?

no guard?- install error?

running well - guess you'll see if it runs better exactly on target!? possibly one tooth isn't enough to bend things.? you could always do a leak down test to?verify integrity.

Let us know?what you find and how it runs!

Andy Vanis

USA and Whatsapp +1(505) 304-5306



On Thu, Mar 6, 2025 at 6:11?PM Ryan C via <candagrm=[email protected]> wrote:
I went to do a timing belt change for the first time since conversion and got to setting TDC before removing the old belt. I noticed that the timing mark on the crank sprocket appears to be off by one tooth while the cams seem to be perfectly aligned. The van was running well. How is this possible?? Another observation I made was that the belt guide is not in place. This conversion was done by RMW so I was surprised to not see the guide. Donor car VIN lists MT so it should have been there, no?
?
Thanks in advance for any insight.??
?
?
?


 

Good call on the leak down. That will probably be my next step. I'm just baffled that it seemed to run smoothly like this.??


 

Way back I changed the timing belt in our 98 Forester 2.5 DOHC and previously someone had installed the belt one tooth off. Now I can't exactly recall whether it was off on one of the cam gears or the crank gear, bit fwiw the car had been running fine and ran even better after the new belt was correctly installed.
I later mentioned to a mechanic friend about the trouble I had keeping all four cam gears in position while installing the new belt, as two or more really didn't want to sit still. He said he uses zip ties to hold the belt to the gears while installing - seems like a good idea.
Jim

On Thu, Mar 6, 2025, 8:11 p.m. Ryan C via <candagrm=[email protected]> wrote:
I went to do a timing belt change for the first time since conversion and got to setting TDC before removing the old belt. I noticed that the timing mark on the crank sprocket appears to be off by one tooth while the cams seem to be perfectly aligned. The van was running well. How is this possible?? Another observation I made was that the belt guide is not in place. This conversion was done by RMW so I was surprised to not see the guide. Donor car VIN lists MT so it should have been there, no?
?
Thanks in advance for any insight.??
?
?
?


 

I use clamps?

Andy Vanis?
505-304-5306 USA and WhatsApp

On Thu, Mar 6, 2025, 7:31?PM wallaces_21 via <grandfatherjim=[email protected]> wrote:
Way back I changed the timing belt in our 98 Forester 2.5 DOHC and previously someone had installed the belt one tooth off. Now I can't exactly recall whether it was off on one of the cam gears or the crank gear, bit fwiw the car had been running fine and ran even better after the new belt was correctly installed.
I later mentioned to a mechanic friend about the trouble I had keeping all four cam gears in position while installing the new belt, as two or more really didn't want to sit still. He said he uses zip ties to hold the belt to the gears while installing - seems like a good idea.
Jim

On Thu, Mar 6, 2025, 8:11 p.m. Ryan C via <candagrm=[email protected]> wrote:
I went to do a timing belt change for the first time since conversion and got to setting TDC before removing the old belt. I noticed that the timing mark on the crank sprocket appears to be off by one tooth while the cams seem to be perfectly aligned. The van was running well. How is this possible?? Another observation I made was that the belt guide is not in place. This conversion was done by RMW so I was surprised to not see the guide. Donor car VIN lists MT so it should have been there, no?
?
Thanks in advance for any insight.??
?
?
?


 

I had the same issue when I installed a timing belt on my EJ22. I ended up prioritizing the crank position and my cams were a bit off. It wasn’t one whole tooth though, it was like 1/2 a tooth distance. So I shrugged my shoulders and ran with it (non-interference 1990 variant) and everything was fine. I’m not sure if this is typical, or helpful to you, but that was my experience.


 

A new guide can't be too expensive; I like the peace of mind it gives.
Terry A Shaw


On Thu, 6 Mar 2025 at 20:11, Ryan C via <candagrm=[email protected]> wrote:
I went to do a timing belt change for the first time since conversion and got to setting TDC before removing the old belt. I noticed that the timing mark on the crank sprocket appears to be off by one tooth while the cams seem to be perfectly aligned. The van was running well. How is this possible?? Another observation I made was that the belt guide is not in place. This conversion was done by RMW so I was surprised to not see the guide. Donor car VIN lists MT so it should have been there, no?
?
Thanks in advance for any insight.??
?
?
?


 

A new guide costs $9.99 for an OEM Subaru one on Amazon.? Cheap insurance.


 

I’ve already got one in hand. Definitely a reminder to everyone to check that these are already in place.?


 

I agree with John Boyer. ?I prioritized the crank position which left the cam marks off possibly a half a notch. ?
--
Warren
89 Westy?
88 Tintop
70 Westy


 

Sorry. ?Jason Boyer.
--
Warren
89 Westy?
88 Tintop
70 Westy


 

I got this thing all timed up and running again. Close call! Compression checked out on all cylinders. Everything lined up perfectly with the new belt.
?
Just a tip for anyone trying to prime a new oil pump. I took the filter off and gave it a good 20 seconds of constant cranking with the spark plugs removed and fuel cut off to get oil to start flowing from the filter housing.?
?


 

I was planning on removing the plugs and spinning it over a bit, but by removing the filter you can confirm that’s it’s pumping. Thats a great idea.?
--
Warren
89 Westy?
88 Tintop
70 Westy


 

Yes, this also relieves some of the head pressure from the pump, especially if you pre-filled the filter with oil. I couldn't get the pump to prime with the filter installed despite many attempts. It primed right away after a long crank without the filter.??


 

When I installed my oil pump I squirted it full of Lucas assembly lube, which is pretty viscous. However, it’s now been sitting for some time so I’m sure it has drained down by now.?
--
Warren
89 Westy?
88 Tintop
70 Westy