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Problem with rebuilt head, oil pooling on intake #4
This is a brand new rebuilt head, 0 miles on it. I placed it onto my 86 motor, many of you know the debacle with that cracked block. Anyway, it ran at idle on my 86 engine for about 20 minutes, didn't notice any smoke out the tailpipe, just the headers themselves smoking. I thought it was oil from my dirty hands burning off the headers. I took the head off the block today and noticed oil pooled behind intake #4. All the other 7 are clean. The motor has been sitting on it's side as pictured for about 48 hours now with a full ~6.5 quarts of oil in it, and I do not know what position the camshaft was in so that intake valve very well could have been open before I removed the cam tower and head. Is it likely that oil pooled into an open valve from sitting sideways like that (I think this is unlikely, as it would have had to flow past the rings and piston), or did the valve stem seal pop off that valve and I need to remove the spring and reseat it?
Dont ask about why the motor is sitting on a furniture dolley, I dont have room for two engine stands! As it is I've got 5 complete motors laying around in my apartment + 2 transmissions + a garage worth of parts and I also have the most understanding girlfriend in the world...
As you can see the head is so fresh, you can still see the machinists' blue from the valve job.
Pull the valve..that much oil doesn't appear normal...Did the valve seal not sit right on the stem of the guide? You'll have to pull it to make certain. Just my.02 cents.
Wow. That's a lot of stuff just to get one 944 back on the road!
All that stuff is to get two back on the road, an NA and a 951 I've collected a lot of parts over the years, been driving and wrenching on these cars for over 6 years now
Im no expert in head rebuilding but I had have few done and that blue is not something you would normally see on rebuilt head..
The blue is totally normal, its how the machinist knows the valve seat is cut perfectly to the valve, they paint the seat and cut material away until rotating the valve in the guide wipes all the blue off the seat. He was a little messy in applying it is all, so it got on the port. It would be gone within a few hundred miles of driving.
And this is just the NA so my reward after all of this will be....driving an NA LOL
Things are looking up though for the 951 motor build, I believe I have finally located a good block for the build, which saves me over 1k bucks. If everything works out, I should be starting work on that motor in the next 4-6 weeks.
Doug..if Michael is supplying the new block...get at least a 30 day warranty..just sayin..LOL!!Just teasing, Michael!! I know that you wouldn't do over our buddy, Doug!
BTW..I won't tell him that it's cracked on #4...Hee Hee.
Well, turns out I was able to press the valve stem seal on intake #4 at least 2-3mm deeper onto the guide. I felt it snap into place when it bottomed out. I assume they are meant to bottom out against the bottom of the head, all the way down on the guide as far as they will go. I am sure that was the cause of the oil leak. Since the other 7 valves were dry I did not bother taking the springs off and checking them. I applied assembly lube to the valve and reassembled the springs and bolted the head on. Hopefully it doesn't smoke upon startup.
06-22-2016, 02:22 AM
Problem with rebuilt head, oil pooling on intake #4
I've collected a lot of parts over the years, been driving and wrenching on these cars for over 6 years now 
