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G4CS Timing belt

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Anthony Boni

5+ Year Contributor
213
23
May 13, 2018
Wrightstown, New_Jersey
Hello!

I recently purchased a 1990 Eagle Talon TSI with a G4CS block and a 4G63 head. I am about to change the timing belt, idler pully, tensioner, and water pump because I am unsure of the last time this has been accomplished. I have searched the forums for anything that may differ in the mechanical timing between a 4G63 block and a G4CS, but can't seem to find anything. Is there any difference in timing this Frankenstein setup? Is there a specific brand I should go with? Mechanical or hydraulic tensioner? Any help is appreciated. Thanks guys!
 
Big question is if the tensioner arm has been ground to fit a 4g63 belt or they ordered a 2.4 belt from a 94 galant. You'll want to do some investigation to find this out before ordering parts.

Also, verify if you have 94 galant cam gears, or adjustables.

Once you have that info, you can start into creating a parts list.
 
Alright I’ll get on that either today or tomorrow. I’ll dig arround the forums and see what I can find and take a look at the cam gears. Pretty sure they’re stock 4g63 gears but I’m not sure. Thanks!

Little update. After rotating the engine to TDC, it looks like the intake cam is about half a tooth off. Looks like Stock 4g63 cam gears. Not 100% though. I’m about to pull them off to see if I can’t find a part number.

Balance shaft has also been deleted. Just found that out.
 

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Little update. After rotating the engine to TDC, it looks like the intake cam is about half a tooth off. Looks like Stock 4g63 cam gears. Not 100% though. I’m about to pull them off to see if I can’t find a part number.
Half nothing. Thats a full tooth off
 
Looks like stock 4g63 gears. Id get some 94 galant gears or adjustables so you can dial in the cams properly.

That's not how it "has" to be, someone probably didn't want to hassle with adjustable cam gears or couldn't find the right dohc 2.4 gears.
 
Looks like stock 4g63 gears. Id get some 94 galant gears or adjustables so you can dial in the cams properly.

That's not how it "has" to be, someone probably didn't want to hassle with adjustable cam gears or couldn't find the right dohc 2.4 gears.

Will one tooth off have done some damage to the valve train or pistons at all? I was told I could use these 4g63 gears because the G4CS block is the exact same as the 4g63, just 6mm taller. I’ll try and get it straight with this set up. If that doesn’t work I’ll buy some adjustable cam gears.
 
After taking another look, you may be able to adjust that 1 tooth back into position and be ok.
I don't suspect there's any damage, but without opening it up you'll never know. If the motor runs fine then I don't suspect damage has occurred.

The deck height difference causes 4g63 cam gears to be pulled out of alignment, tho I'm sure there are ways to get it perfect. adjustable gears offer you the ability to fine tune things easier.
 
After taking another look, you may be able to adjust that 1 tooth back into position and be ok.
I don't suspect there's any damage, but without opening it up you'll never know. If the motor runs fine then I don't suspect damage has occurred.

The deck height difference causes 4g63 cam gears to be pulled out of alignment, tho I'm sure there are ways to get it perfect. adjustable gears offer you the ability to fine tune things easier.

She purred the whole way home so I think it’s fine and I can rotate the motor freely now and not feel/hear anything. I’ll try and get that tooth straight and keep an eye on it when I get it back running. In the meantime, I’ll research some adjustable cam gears and see what I want to go with. Thanks for all the help @tametalon92. You’ve been a lot of help these past few days.
 
I wouldn't try to line the mounts up just yet... they could be offset in order to accommodate for the lack of 2.4L cam gears. I opted to run my 4g64 2.4L with the OEM timing belt & the 2.4L Galant DOHC cam gears. Both of them used to be available from www.extremepsi.com, but apparently one of them has been discontinued. They both have a "D24" number stamped onto them though & are easily identifiable... if not then you are running 2.0L gears that have been manually adjusted for the 2.4L block

2.4L Exhaust cam gear:
http://www.extremepsi.com/store/product.php?productid=20293&cat=865&page=1

2.4L Intake cam gear:
http://www.extremepsi.com/store/product.php?productid=20294&cat=865&page=1

It is my understanding that both 2.0 & 2.4L gear sets have their timing mark locations roughly 1.5 teeth off from each other
 
I wouldn't try to line the mounts up just yet... they could be offset in order to accommodate for the lack of 2.4L cam gears. I opted to run my 4g64 2.4L with the OEM timing belt & the 2.4L Galant DOHC cam gears. Both of them used to be available from www.extremepsi.com, but apparently one of them has been discontinued. They both have a "D24" number stamped onto them though & are easily identifiable... if not then you are running 2.0L gears that have been manually adjusted for the 2.4L block

2.4L Exhaust cam gear:
http://www.extremepsi.com/store/product.php?productid=20293&cat=865&page=1

2.4L Exhaust cam gear:
http://www.extremepsi.com/store/product.php?productid=20294&cat=865&page=1

It is my understanding that both 2.0 & 2.4L gear sets have their timing mark locations roughly 1.5 teeth off from each other
Thanks for the info man. So, could I use any 4g64 cam gear or does it have to be from a 94 gallant?
 
Never mind I’ve found it now. I’m searching G4CS specific; that’s why nothing is coming up. This is the same as timing 4g64 block to a 4g63 Head? If that’s the case there are dozens of threads out there that explain exactly what you both have been telling me.
 
If you're talking about OEM cam gears, then yes, it has to be off a 94/95 Galant 2.4L DOHC. That was the only year that they came out with that setup in the states, IIRC. Adjustable cam gears would also suffice, as long as you have a way of setting them up correctly.

I went with the OEM 4g64 2.4L DOHC gears years ago, with my 2.4 4g64 build for my 1g. I have a set of adjustable cam gears that I've picked up since then, but I still haven't installed them yet. The 4g64 gears do require the use of the 4g64 timing belt... I've ran mine this way now for at least 5 timing belt changes now... some 12 years or so.

The 4g64 is essentially the same as your 4GCS block, without the extra oil return ports that you should have had to block off, when running a 4g63 DOHC head. A lot of the info available online can be interchanged between them both, as both were 2.4L DOHC motors
 
Understood so everything is the same except the cam gears and the timing belt. Everything else is interchangeable? Idler pully, tensioner etc.. I also have my balance shaft deleted. Not sure if that will change anything. Again thanks for the help I’m learning a lot
 
Cool man so 4g64 gallant timing belt and intake/exhaust cam gears. Everything else is interchangeable. I’ll go ahead and start ordering everything. Thanks a lot!
 
No problem... just be sure that the gears that you've got on the car are in fact 2.0L DOHC gears first though.

Since one of those was discontinued, you might be better off with adjustable cam gears. But then you'll need to degree the motor in order to set them up correctly... this is why I haven't switched over to them myself yet
 
No problem... just be sure that the gears that you've got on the car are in fact 2.0L DOHC gears first though.

Since one of those was discontinued, you might be better off with adjustable cam gears. But then you'll need to degree the motor in order to set them up correctly... this is why I haven't switched over to them myself yet
Just looked. Both say D20 on them. I’m guessing that’s stock 4g63 cam gears
 
That would explain why they were intentionally set off from the factory timing marks. I would be very careful when doing your timing belt, if you plan on reusing either of those 2.0L OEM cam gears.

I'd mark the 2.0L gears current location @ TDC before removing the old timing belt... I'm guessing that you'll find that the 2.4L OEM gear marks will line up with the old 2.0L gear marks that you made (provided that the 2.4L was setup right initially).
 
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