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4jg2 timing belt replacement

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4jg2 crank seal / cam seal job

Postby greenwolverine » Tue Apr 24, 2012 1:04 pm

Thanks for everyone's advice on this thread.
Here is my write up on doing the seals, with some tools to make
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Re: 4jg2 timing belt replacement

Postby MrRevhead » Sat Apr 28, 2012 11:45 am

^ Good tips there

I've had a disaster doing my cambelt today :cry:
First issue was crank bolt.... It broke off in the crank :evil: It's not a silly l/h thread is it?! Need to figure out how to remove it. Might have to resort to calling out an expert.

Next thing is:
http://farm8.staticflickr.com/7086/6974 ... b601_z.jpg

Might explain the horrible rattle it has on start up at times. The end of the crank and the key way look ok. So hopefully I can save it. Would really really hate to have to replace the engine because of this :evil:

So, plan today was to change water pump and cam belt + seals. All I have accomplished is breaking things :?
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Re: 4jg2 timing belt replacement

Postby geeves » Sat Apr 28, 2012 5:15 pm

issue one is a bit nasty How did you break that??? Especially with issue 2 which is normally caused by a loose crank bolt
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 4jg2 timing belt replacement

Postby MrRevhead » Sat Apr 28, 2012 5:48 pm

Went ping when I tried to undo it.
I suspect when the belt was done last time the keyway was damaged or something. The pulley has definitely been chattering away on there and I think that has stressed the bolt. Looking at the end of the thread still in there I can see a lot of loctite so I think they have caked it on.
I'm guessing they didn't do the bolt up tight enough to hold the pulley and the loctite is whats holding it in.
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Re: 4jg2 timing belt replacement

Postby geeves » Sun Apr 29, 2012 7:13 am

Only way I can think to remove that bolt is drill a hole in it and use a big easy out. Its high tensile and Im guessing you need a 10mm minimum hole 20mm at least into it. Dont do what I did on a far less important bolt and break the drill off in the hole. I dont see this as being possible with the engine in place. Other option would be a phone call to a local engine reconditioner. They do have some magic tricks but be prepared for the cost of engine out crank out and new bearings.
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 4jg2 timing belt replacement

Postby MrRevhead » Sun Apr 29, 2012 7:42 am

No way an easy out will work. Too much loctite in there.
Rather migging a bolt on to the end of it and turning that. Heat from welding should melt the loctite. Either way I'm not trying it, I'm knocking on some mechanics doors tomorrow.
Should be doable in place, I've got the rad out and there's heaps of room
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Re: 4jg2 timing belt replacement

Postby ubs55 » Sun Apr 29, 2012 8:19 am

Heres a thought, Drill a hole through the centre and use an oxyacetylene torch and focus the heat on just the bolt alone then use a chisel and hammer to hit the bolt around. yea ezy outs don't typically work too well in past experience, if only you could tap some left hand thread into it
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Re: 4jg2 timing belt replacement

Postby MrRevhead » Sun Apr 29, 2012 8:37 am

Yeah something like that would be a good plan.
If it was my Corolla I'd be out there now giving it a go. But Corolla engines are cheap!
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Re: 4jg2 timing belt replacement

Postby geeves » Sun Apr 29, 2012 1:47 pm

experience with corolla engines says you never have this problem. When my carib showed signs of a leaky head my tame mechanic said it would be cheaper to just change the whole engine. I then reminded him that the carib is awd and engine out is a 10 hour job. I sold it a year later still with the leaky head but another 30000km on it
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 4jg2 timing belt replacement

Postby MrRevhead » Sun Apr 29, 2012 1:57 pm

Yeah, sometimes they are just too good!
On those it's usually the pulley slightly rusted on that gives problems
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Re: 4jg2 timing belt replacement

Postby MrRevhead » Mon Apr 30, 2012 5:28 pm

Well flatbed truck pick it up tomorrow to cart it off to the engine builders so they can extract the bolt remains.
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Re: 4jg2 timing belt replacement

Postby Langbein » Sat Oct 24, 2015 11:56 am

Hi all, I have read all the posts (very helpful) and still have oil leaking. I have put on a speedy sleeve ( due to groove on shaft), new oil seal and new o-ring. Even sealed oil seal housing in with Three Bond. All to no avail, this is about the 7th attempt. The upside is I'm getting really good at replacing the timing belt.
Can anyone suggest something useful ?
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Re: 4jg2 timing belt replacement

Postby geeves » Sat Oct 24, 2015 1:15 pm

Which engine?
A photo of the leak might help as it might not be the seal at all.
I got your email but its better answered here where people with a lot more knowledge than me can also see it
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 4jg2 timing belt replacement

Postby Langbein » Sat Oct 24, 2015 1:56 pm

4jg2 turbo. I have stripped it back down since, and just got your message. Unfortunately, have cleaned up the leaking oil, so pointless taking photo unless I re assemble and run it. When I pulled off the oil seal housing ( that I sealed in with Three Bond) I expected to see traces of oil throughout, but it appeared clean, so concluded that it isn't leaking from around the o-ring/ behind housing.
This takes me back to square one AGAIN.
Was thinking of re assembling without timing cover so I can try and see where the leak is coming from.
Thoughts??
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Re: 4jg2 timing belt replacement

Postby geeves » Sat Oct 24, 2015 4:13 pm

one possibility is worn bearings allowing the cam to move off center
Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 4jg2 timing belt replacement

Postby ecw23able » Mon Dec 09, 2019 5:52 am

geeves wrote:If there is evidence of leakage they should be done. If the job is done by a mechanic they would strongly suggest doing them and a lot of people here would agree. My wagon is on its third belt and still original seals.
I will send you a copy of the engine manual that covers the 4jg2 and 4jb1 engines


Geeves, Is there any chance you could please send me the manual as well?

Is there anyway to tell if its a square or round belt without having to remove all the covers, Surely there is a quick way to check,

And as others have pointed out doing the seals is easy, I've never done the seals but what is involved in doing the seals, Could anyone give me a breif overview?

Any help would be appreciated as I have a coolant leak the apprears to be coming from the water pump, There is no oil in the collant and no collant in the oil so that all looks good but I figure is will be wise to do the T belt whilst I do the W pump.
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Re: 4jg2 timing belt replacement

Postby geeves » Tue Dec 10, 2019 1:46 pm

Sanding your knuckles before starting work can help. That way you cant skin them
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Re: 4jg2 timing belt replacement

Postby jhowie » Wed Jun 30, 2021 3:19 pm

Howdy all Is the 4JG2 engine manual available still - I would prefer to replace the camshaft seal when I do the timing belt but need to understand how I can keep the camshaft locked in place without the pulley ( as far as I can work out I need to take off the belt and camshaft pulley to get to the seal ) - any advice about this step much appreciated
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Re: 4jg2 timing belt replacement

Postby geeves » Wed Jun 30, 2021 5:56 pm

If you put the 3 bolts in before removeing the belt and mark the pulleys and old belt then transfer the marks to the new belt before removeing the pulley you cant go wrong put the bolts back in when you reinstall the pulley. Its on a keyway
Sanding your knuckles before starting work can help. That way you cant skin them
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