DOHC timing belt install tips

Heads, valves, pistons, rods, crankshaft, etc...

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James614
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DOHC timing belt install tips

Post by James614 » Sun Oct 20, 2013 9:45 pm

Okay I'm re-positioning the timing belt on my EJ20G with the engine in the car, and as far as I can tell its physically impossible to see the marks for the lower passenger side cam sprocket or accurately count teeth. Anyone have some super-secret tips for DOHC setups?

Also, any good way to hold the belt on those sprockets?
93 Touring Wagon (EJ20G 5spd Swap) -- Finally back and running strong as ever!

05 Outback 2.5XT 5spd -- Now the wife can have her SUV and get in on the turbo Legacy goodness at the same time.

Legacy777
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Re: DOHC timing belt install tips

Post by Legacy777 » Sun Oct 20, 2013 10:03 pm

Something like this works to hold the belt to the sprocket.

Image
Josh

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wtdash
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Re: DOHC timing belt install tips

Post by wtdash » Mon Oct 21, 2013 3:59 pm

I used something similar...of course, w/engine OUT it was easier. Do you remove the radiator for more access?
I'd go read up on the USMBsite. Should be tips/tricks over there....you definitely want to count the teeth, IMHO.

Image

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James614
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Re: DOHC timing belt install tips

Post by James614 » Mon Oct 21, 2013 4:08 pm

I bought similar clips and it made install much easier. But I had the cam gears 90* off from each other (had the belt lines up on the double marks). How hard is it to replace valves on a DOHC head?

:-(
93 Touring Wagon (EJ20G 5spd Swap) -- Finally back and running strong as ever!

05 Outback 2.5XT 5spd -- Now the wife can have her SUV and get in on the turbo Legacy goodness at the same time.

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Re: DOHC timing belt install tips

Post by cj91legss » Tue Oct 22, 2013 3:31 pm

Probably not much harder than a sohc, the valves come out the same way. You can get this fancy guy if you don't have anything to get valve springs compressed.

http://www.ebay.com/itm/COMPANY23-VALVE ... e8&vxp=mtr
91 L-TW Wagon with a full Swap -RIP
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93 SS Bone Stock Gone!
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91 SS 4EAT Sold!
98 LGT 4EAT
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martimus919
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Re: DOHC timing belt install tips

Post by martimus919 » Tue Oct 22, 2013 5:04 pm

I use a small mirror to check my marks after marking them with a white out pen to make them easier to see.

I also have two of these tools, one at work and one at home and they work amazing. They however do not work on 08+ STi's.

07 Outback XT VF52
94 Legacy Sport, VF23, 550 RobTune, various other things
93 Legacy Touring Wagon EJ205 management and dash swap (in progress)
90 Loyale Turbo, EJ Turbo Swap, 2" lift
82 Brat, EJ22 swap, RX AWD trans w/ LSD rear, 5 lug 4 wheel disc.

James614
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Re: DOHC timing belt install tips

Post by James614 » Tue Oct 22, 2013 8:48 pm

How does that lock tool attach?
93 Touring Wagon (EJ20G 5spd Swap) -- Finally back and running strong as ever!

05 Outback 2.5XT 5spd -- Now the wife can have her SUV and get in on the turbo Legacy goodness at the same time.

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Re: DOHC timing belt install tips

Post by martimus919 » Tue Oct 22, 2013 10:12 pm

Sorry for the crapy pics, I just pulled them off Google real quick.

Image

Image
07 Outback XT VF52
94 Legacy Sport, VF23, 550 RobTune, various other things
93 Legacy Touring Wagon EJ205 management and dash swap (in progress)
90 Loyale Turbo, EJ Turbo Swap, 2" lift
82 Brat, EJ22 swap, RX AWD trans w/ LSD rear, 5 lug 4 wheel disc.

James614
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Re: DOHC timing belt install tips

Post by James614 » Tue Oct 22, 2013 10:33 pm

I may have to pick that up. The left-side cams snapping shut with the belt off is a big problem too.

If only I had asked thus before the first time I tried to do the belt, I would probably be driving my car now.

I'm surprised the FSM doesn't specify a Subaru tool for locking the gears together during a timing belt service.
93 Touring Wagon (EJ20G 5spd Swap) -- Finally back and running strong as ever!

05 Outback 2.5XT 5spd -- Now the wife can have her SUV and get in on the turbo Legacy goodness at the same time.

martimus919
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Re: DOHC timing belt install tips

Post by martimus919 » Tue Oct 22, 2013 11:31 pm

I don't think I've ever done one that hasn't spun on me with out that tool.
07 Outback XT VF52
94 Legacy Sport, VF23, 550 RobTune, various other things
93 Legacy Touring Wagon EJ205 management and dash swap (in progress)
90 Loyale Turbo, EJ Turbo Swap, 2" lift
82 Brat, EJ22 swap, RX AWD trans w/ LSD rear, 5 lug 4 wheel disc.

cj91legss
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Re: DOHC timing belt install tips

Post by cj91legss » Wed Oct 23, 2013 3:18 pm

I've used vise grips with just enough tension on the gears to keep them in place and not damage them. Or I'll use a pair of grips and a quarter at the timing marks, pinch the belt between the quarter and the cam gear.
91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT

martimus919
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Re: DOHC timing belt install tips

Post by martimus919 » Wed Oct 23, 2013 3:26 pm

I used vise grips once, ended up breaking the cam gear and that turned into a huge night mare.
07 Outback XT VF52
94 Legacy Sport, VF23, 550 RobTune, various other things
93 Legacy Touring Wagon EJ205 management and dash swap (in progress)
90 Loyale Turbo, EJ Turbo Swap, 2" lift
82 Brat, EJ22 swap, RX AWD trans w/ LSD rear, 5 lug 4 wheel disc.

cj91legss
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Re: DOHC timing belt install tips

Post by cj91legss » Wed Oct 23, 2013 3:29 pm

Yeah, you gotta be careful with those. Mostly if you have Plastic gears. I have 3 metal gears and 1 plastic gear on my engine.
91 L-TW Wagon with a full Swap -RIP
92 SS Prefaced, GD dash swapped, 22T/205 Hybrid 20 psi - BEAST!
93 SS Bone Stock Gone!
94 TW Bone Stock Gone!
91 SS 4EAT Sold!
98 LGT 4EAT
98 LGT Wagon 4EAT

martimus919
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Re: DOHC timing belt install tips

Post by martimus919 » Wed Oct 23, 2013 4:29 pm

Metal you could get away with it. I had to keep going tighter and tighter to get it to hold, until it snapped.

All because I wanted to get the job done that night and forgot that holder at work.
07 Outback XT VF52
94 Legacy Sport, VF23, 550 RobTune, various other things
93 Legacy Touring Wagon EJ205 management and dash swap (in progress)
90 Loyale Turbo, EJ Turbo Swap, 2" lift
82 Brat, EJ22 swap, RX AWD trans w/ LSD rear, 5 lug 4 wheel disc.

dafrompa
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Re: DOHC timing belt install tips

Post by dafrompa » Thu Jul 18, 2019 4:39 am

Driver side cams move after I take the off the clamps off. I have an old style tensioner. Sometimes the belt seems lose in between the 2 cans on that side. Looking for advice

mike-tracy
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Re: DOHC timing belt install tips

Post by mike-tracy » Fri Jul 19, 2019 2:07 am

Are you installing the belt with all the idler bearings installed? I leave the bottom one on the passenger side off when I install the belt. After putting on the belt, but before installing the last bearing, I use my breaker bar to rotate the crank towards the passenger side by several teeth. This puts enough slack in the lower part of the belt that I can install the bearing without stretching the belt at all. Obviously afterwards I rotate the crank several revolutions to ensure timing is still on.

Maybe a second set of hands with a small breaker bar on one of the driver side cam gears would help them not slip as you install the other side.

I'm a visual guy, and I have referred to this video more than once:
I believe it is our very own Jamal.
1992 Legacy SS 5mt, build in progress
Josh Colombo wrote:
Mon Jan 14, 2002 10:23 am
Wait....I'm confused now.

dafrompa
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Re: DOHC timing belt install tips

Post by dafrompa » Sat Jul 20, 2019 3:50 am

I leave the lower bearing off till the timing setup then put the tensioner in place then tighten down release the pin then take off the clamp on drive side. Old style tensioner

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Re: DOHC timing belt install tips

Post by kimokalihi » Mon Aug 05, 2019 6:47 am

Just get yourself a few of those black office clips and clamp the belt to the pulleys on the driver's side so it won't slip when you're putting it on. Pretty easy. The black metal clips with the chrome arms.
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Re: DOHC timing belt install tips

Post by Legacy777 » Mon Aug 05, 2019 5:18 pm

Yes, that's a great idea. I used some clamps even on my ej22t install.
Josh

surrealmirage.com/subaru
1990 Legacy (AWD, 6MT, & EJ22T Swap)
1997 Impreza OBS

If you need to get a hold of me please email me rather then pm

dafrompa
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Re: DOHC timing belt install tips

Post by dafrompa » Sun Aug 18, 2019 1:54 am

The video really helped. I was trying to slide it on like I've seen most YouTube videos not get the mark on the cam then more the cam like the video shows used my clips to hold the timing. I got the car to run today super stoked about it. Thanks for the help.

mike-tracy
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Re: DOHC timing belt install tips

Post by mike-tracy » Sun Aug 18, 2019 4:49 am

Yay! Glad it worked
1992 Legacy SS 5mt, build in progress
Josh Colombo wrote:
Mon Jan 14, 2002 10:23 am
Wait....I'm confused now.

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