have you cleaned the entire engine since the vaccuum pump replacement?
you should, and then drive it for some miles to see any new wet spots.
I’m planning to do the whole timing chain kit, so new chains, guides, tensioners, valve cover gaskets. I’ve read enough forums to know I should just change the chains while I’m there, some say they stretch, and with 125k on the clock why not. As for other accessories, water pump for sure, alternator if I can see that oil has been leaking into it. Injectors I am going to see what happens, I’ve had some people say buy them because I’m going to break them. I will see what happens, those are easy enough once I make it to that point of reinstall.IMO you should give the engine a good cleaning and then drive it, park it, and check it. Maybe you'll be better able to isolate the leak. As you said, you're committed to replace the tensioners which is good. However, if it doesn't solve the leak, you'll be back to square one. And if you can determine the exact cause, it may be in a location where you can tackle it when you have everything apart doing the timing chain guides. Curious, what other parts are you planning to replace when you do the tensioners... water pump? valve cover gaskets? new injectors?
Yes, preventative from what I’ve read about the tensioners.im taking this as you are doing the timing chain job as preventative then? good for you if thats the case.
or you know that your timing covers are the issue, and you may as well do the guides while youre in there?
If i was me, id replace the chains while in there.