Hi guyz, wondering if you gurus can help me out? been seeing a few zeds of late I've come across a well look after z that I had a pre purchase test done on it by a well known zshop in Melbourne, came back with bad news that the number six cylinder head has no compression and concluded that the valves are sticking etc, the car is a 89 model, pre 93 cars I think had a problem that was fixed 93 onwards(correct me if I m wrong) so need advise, can somone let me know how much this would cost to fix and who would be the people in melbourne to talk to I was quoted $4000 by this known shop, thanx.... this car is worth doing cause seen heap cars already and this one is the pick of the buch...
The best thing about buying a Z needing a rebuild, is the fact that once finished you can drive it with some confidence. Mine came in at $3700 but that was with the 100k service and including every fuel & coolant & vacuum hose being replaced. This also included replacing the oem waterpump for a high performance electric pump and fan by davies craig. Not sure if your going with a turbo model or not but I would insist that the engine was pulled for the job as opposed to struggling with it in situ. Make sure that you get the plenum pull bypasses done including the egr,aiv removal.etc, I think 4k is a bit much for just a head rebuild alone though.imho, Goodluck with it, take your time and be thourough.
Would probably have a go in-car on an NA, but definately engine out on a TT. Thats where the labour costs are! My heads alone were about $1k each, with new valves,seats, guides ported & polished chambers,remember that you're buying 24 valves, seats &guides and the old seats have to be machined out. A fair bit in parts and labour, so with an engine pull & install at about $1500 plus "extra's and head rework, $4k wouldn't surprise me :zlove: Got a top spot in Qld, can't help down south
What work is included in your price? I got quoted $500/head max for a head service inclding polishing and valve grinds, but that is supplying my own valves and springs and everything removed and dropped off to the engine shop. If that price is for drive in/drive out it's probably not too bad. As the others said get a 100k service and all the plennum pull (hose bypass, new heater and coolant hoses, new vacc lines, PCVs and hoses, new gaskets) work done while it's in bits.
Just had another read of your post and not sure about a couple of things What else did they do to conclude valves? Make sure they have done a leakdown test as this will go a long way to confirming diagnosis, you wouldn't want to go to the trouble of pulling heads off in situ and find that your problem was shot rings... I'm sure they've done all of this but for your own benefit make sure. What problem is this? You mean with the valves? Haven't heard that before, heaps of series one cars floating around thanks to 15yr rule, some pretty good (some pretty bad...) so I wouldn't rule out an older car... Mine is a '91 so same series and no problems with internals. Are you sure about this? Seriously a dead engine is a pretty BIG problem.... Cost can easily blow out from the $4000 depending on what other upgrades you decide to do or what other problems arise. That kind of money could fix alot of problems in the other cars you've seen... I reckon that's worth keeping in mind. Anyway good luck with it, all just my opinion at the end of the day if the car is in the hands of good mechanics you can't go too far wrong. If the shop is a well known Z-Shop they may well be able to offer some advice as to whether or not the car is "worth it" or if you're better of waiting.
I think he's referring to "soft valves" - although I think this only affected US cars not J-spec the car is a 89 model, pre 93 cars I think had a problem that was fixed 93 onwards(correct me if I m wrong) What problem is this? You mean with the valves? Haven't heard that before, heaps of series one cars floating around thanks to 15yr rule, some pretty good (some pretty bad...) so I wouldn't rule out an older car... Mine is a '91 so same series and no problems with internals.
Candu I think you're right as I remember reading something about this on the US forums... I think injectors were a problem with US cars as well...
fradda your not haveing much luck. One burnt zed, one low comp zed, wtf's next! Is this the car from z----, they said the engine was good? Did you get a warranty,i could imagine your pissed off at the moment! I reckon four thou is a little to much to reco the heads, what were they going to supply, parts wise for that price, also the heads can be pulled engine in car.I hope things take a turn for the best soon dude.
Agree with Rob on this. From my understanding failure in #6 is mostly due to heat caused by detonation and poor cooling. This was the case with mine and most others with #6, flow tests have shown that it runs leaner than the other 5 cylinders. I had a comp test done and had low read on 6 even with a leakdown test. The ringlands failed and so it was a rebuild. You can remove the filler cap with the motor running and check for blow-by. Engine rebuild total cost for a shop to do won't leave you much change from 10k. If you pull the engine and refit yourself you'll save 5 or 6k
thanx guyz for all your input but this morning the zshop called done another compression test and all came up alright she was dead cold when they did it so hopefully this means it should be ok. Another test wil be done to make sure that its all good, it sure suprised the owner the mechanic cause all work history has been done at this shop, its had all the plenum work done and some so it has been looked after. so now its back to plan A and in my garage this weekend or next.. thanks again and on track
hey Trav things turn in a day in the land of ZED looks like it ok so cross fingers the next test comes back with the right figures, IT sometimes pays to do these test so you know what your getting dude but it all looks sweet again
recons he needs to pull engine out for a few days all labour by the hour clock stocky parts etc thats it suppose head polish them didnt ask was shell shocked...but second test done this moprnin and they came back good need to do another one see how that goes...
rob thanx for that last bit of insight yeah your right about the money going into those other cars and about that pre 92 prob with valves think they wher superseeded from 92 onwards not qiute sure the specs on it but Ihave heard about this before only 4 weeks born into zed land and still growing dude thanx
$500 / head for grind etc is high. Mine included, as I said, 24 new valves,24 new guides, 24 new seats and the machining to fit them all
