after breakfast we headed back up to seattle (glorious morning for a drive) to replace jim's aging valve guide seals. he had been noticing a puff of smoke on cold startup as well as some smoke during high vacuum driving conditions (long downhills under engine breaking) and we were hoping this was the culprit.
the project went smoothly and we didn't loose any valve keepers in the hole of doom... i had read a post about using vinyl tubing to hold the valves up in lieu of rope so i picked up $1 worth of the stuff at ACE and it worked a treat. much easier than stuffing wads of rope in the cylinders and much easier to get it out. the old seals were completely useless: rock hard and stretched out like an old sock - they practically fell off.
While we were at it, we did a compression test (170, 170, 170, 160, 170, 170) and used the little scope camera to peek in at the bores. the pistons were a little cruddy on top (no doubt from those old seals) but the bores looked great.
we finished, fired it up and were pleased that she ran well and no puff of smoke at cold startup - mission accomplished!
we were about to close the hood i noticed what looked like a blonde hair waving in the air stream of the fan off of one of the injector hoses - i reached down to pull it off and realized HOLY SHITE: it was a fine stream of gas squirting onto the manifold! we shut it off immediately and saw that 4 of the 6 injector hoses were leaking and dripping right down onto the exhaust manifold which (thankfully) was not yet hot. seems they were old and cracked, and during the valve work we flexed his fuel rail around a little and the cracks opened up and started pissing fuel. pulled 'em all off and went straight to o'reilly's and picked up a couple of feet of new efi hose and had 'em all replaced in short order - no more leaks. really scary, as jim's getting ready to do a 2,400 mile cross-country drive and that would have been a very unsafe situation. shudder to think that a beautiful z could have gone up in flames for lack of $9 worth of hose - something to check regularly!!
all in all, a well spent sunday,
valve guide seals - which one would you rather have?
nice rockers - perfect wipe pattern, perfect finish (must be using the right oil...)
disaster narrowly averted:
old hose:
all done: