The camshaft seal keeps on popping out j2 elantra 1600

indicates that there is a major problem in the cam shaft bearing alignment
This is generally from having the head machined at some point of time to remove a wapage and when properly torqued down the bearings are no longer in alignment
( sort of like trying to make the solid shaft run in an arc)
If the bearings are in individual posts bolted to the head , the fix is to have both the gasket face machined and then the head turned over and the posts faces machined
If the bearings are part of the head then the bearings have to tunnel bored and oversized bearings used
In that case it is generally cheaper to get a new head
Talk with an engine reconditioning shop as to the best method of fix

thats got a cracked head get a preasure test done on head

The front of the engione must be torn down and the cam belt removed.

The engine ID number is above the trans, printed on the block, below the head. There may be a emission decal under the hood showing a J1 or J2, if you call the Hyundai Parts dept with your VIN number they should be able to tell you.

Go to www.hmaservice.com and register your vehicle by VIN #.. you'll then have access to wiring diagrams, shop manuals, service bulletins, illustrations, etc.

Tightening torque

Cylinder head bolt [cold engine] . . . . . . . . . . . . . . . . . . . . . . . . . . .

105-115 Nm (1050-1150 kg.cm, 76-83 Ib.ft)

dear friend:here follows the settings in need:
cylinder head-30-35 nm + 30-35 + 65deg + 65deg.
mains-30nm +65deg
big ends- 1 - 26nm 2 - 52NM
fly-wheel -130nm
cam-sprocket - 100-120
crank-pulley - 170-180
cam caps -15nm

1st stage 45lbs then 65 then 85

I found the best way is to take the idle pulley off first then with a little effort you can slide it over the cam pulley. Then reinstall the belt tensioner/ idler pulley and adjust. Do not over tension the belt .

Most of the Public Libraries have all Hyundai manuals

Hi zoom in picture.