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It would be a less involved job that installing a timing belt.
Set the engine to TDC- i.e. "0" mark aligned with line on front of timing cover. Make sure the cam is also aligned at its mark. You may have to rotate crank 1 turn if cam is off 180°.
Remove upper timing cover, probably have to remove the fan (4x 10mm nuts).
Loosen the timing belt tensioner, push it back, lock tensioner down.
You'll need to loosen the cam sprocket bolt. This bolt is different sizes on different years and models but usually 14mm. Every so often, this bolt is a real bear to get loose. Don't use the timing belt to hold the sprocket if you intend to save the belt.
I've had to use a big strap wrench to hold the sprocket while breaking the bolt loose. Really huge channel-locks and a rag to protect the sprocket teeth will work as well. An impact wrench would break this loose most times too, even if the cam turns over.
Once the bolt is loose, the sprocket comes off, you'll be able to pry the back half of the timing cover (Gently!) away from the engine and pull out the cam seal. It should come out with a small screwdriver or a mechanics' pick.
Clean up the bore and the camshaft. Oil the new seal, slide it in. Probably have to press very hard to get it to go in by hand.
Don't forget to fix whatever blew out the cam seal. CLean the flame trap and the small vacuum hose from it to intake manifold. Most likely crankcase pressure made it leak.
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Rob Bareiss, New London CT ::: 87 244DL, 88 245DL, 90 745GL, 84 242DL project, 89 244 parts, 88 244DL to replace the 87
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