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I'm getting a bit beyond my depth on your question. Here's what I have.
Hopefully someone else with more thorough knowledge will write in on this.
Yes, I think there must be some coolant passages behind the engine front seals.
When I told my indy mechanic about the green sludge at underside of timing cover, he said that indicated the engine front seals were leaking. I saw no leaks at the pump itself. This was just before he was scheduled to do a timing belt change, so the seal replacement was a logical addition. I suspect many mechanics would do those seals at the same time regardless, since you would need to do most of the work of a TB change just to get at the seals later when they leak eventually.
He has no reason to stretch the bill - he's a former indy shop mechanic, now working elsewhere, and rehabs bricks in his driveway for himself and friends, occasionally doing some paid work for me.
FCP Groton shows a timing belt kit that includes the belt + the 3 seals: crank seal, intermediate shaft seal, and camshaft seal.
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Sven: '89 245, IPD sways, electric rad. fan conversion, 28+ mpg - auto tranny. 850 mi/week commute. '89 245 #2 (wifemobile). '90 244 (spare, runs).
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