Z31 Turbo Engine + Gearbox rebuild

rhanagar

Well-Known Forum User
Ok its been a few days and the weather has been holding up. Sunny but a bit nippy, however with an extra jumper on all is well ... especially if you keep moving. I have been concentrating on the engine quite a bit. Taking my time but its been a steady progress. I had a couple of nightmares. Bought a can of enamel spray for the engine. Attacked the block with a wire brush and got it down to metal then gave it a coat of black. Bleeding can was duff. All it did was run everywhere leaving a horrible black gack over it. Had to wipe it down and clean it all off with carb cleaner before it set, and then the next day wire brush it all again. Anyways I finally managed to get a good coat on it and finally ended up with this

Passenger Side:

PassengerSideExample.jpg


Front:

FrontExample.jpg


Drivers Side:

DriversSideExample.jpg


Was slightly annoyed at seeing a rust bubble on the sump at the front when looking closer at the photo's just now, but nothing which I cannot sort out over the weenend.

As you can see I also cleaned up the two mounting brackets either side of the sump as well to a nice silver finish. I also gave them a coat of gloss engine enamel spray to keep them from getting too grotty. The sump was taken off as you know, but now on there with its new gasket. Also from the pictures you can make out the oil filter bracket which I removed and cleaned. I like the contrasting silver it has against the black block. All the mounts were removed as well and re-painted to try and keep it all colour co-ordinated and fresh looking. The altenator mounting bracket again removed and painted along with the power steering pump bracket, but that bolts on the head so not present in the photo's. The front shot of the block also shows the work done to remove any rust and grime that had built up over the years Its by no means perfect, but you are never going to see that part once the cam belt covers are back on. However I did give it a coat of enamel to prevent any water from getting to it and truning it rusty. The water pump in an earlier photo showed some serious signs of deteriation, and the water channels in the block where it mounts was just as bad. I managed to get a extendable wire brush attachment for the drill and scoured the inside as much as I could. It all came up pretty clean if I say so myself. Less gack and grime is the better as far as I am concerned, meaning less gack and grime to cause issues later on.

Whilst waiting for things to dry, I looked at the rocker covers. I have already stripped the paint off one and I wanted to go with the theme of red covers like the originals. Anyway here is what I ended up with after some experimentation. I placed it on the engine so people have a better idea of what the finished article could look like.

EngineExample2.jpg


EngineExample1.jpg


EngineExample3.jpg


They are a bit more orange than the originals, but I like them. It contrasts nicely. I think I will be using this method on a few other pieces to get some more colour co-ordination going.
 

rhanagar

Well-Known Forum User
I got hold of a valve compressor yesterday and proceeded to take them out. Here are some examples of the condition they are in.

Inlet Stem:

InletValveTop.jpg


Inlet Face:

InletValveBottom.jpg


Exhaust Stem:

ExhaustValveTop.jpg


Exhaust Face:

ExhaustValveBottom.jpg


Looking at them now I think they can be recovered, as it seems to be just bad carbonisation which is encrusted on there. The seats are still intact if grotty and I reckon with some elbow grease I can get them up to scratch. Time will tell I assume :unsure:
 

rhanagar

Well-Known Forum User
Lol ... its not the wires that is the problem. Its keeping track of all the nuts and bolts. I also seem to have lost my knock sensor. I know I put it somewhere ......
 

rhanagar

Well-Known Forum User
Ok I went out to do some more work and faced this:

18122009685.jpg


so I went inside as there is no heater in the garage. Also the missus refuses to have car parts in the living room :(
 

bigdiesel

New Forum User
Great to see some one working on their own engine. Looking forward to reading more on this.
Unfortunately an engine overhaul is beyond me.
Does any one know where I can get a new or fully reconditioned engine for my 1988 300zx
or will I have to use my wifes micra all the time.
 

rhanagar

Well-Known Forum User
I don't think even the 1.3 micra engine will be enough to pull a 300ZX ... :D

As for doing the work myself. Its something I have said before. I have never done this kind of thing. It was a BIG decision to do it myself and finances was the major factor. Reaserch online, support from many people on the ZClub site, and hours and hours of internet searching sourcing parts and services. In all honesty the engine itself is fairly easy to work on. Nice big bolts, over-engineered parts that are seemingly indestructable, and to be honest logical and effortless construction. Once you get over the initial fear and make sure you label everything your not sure of and lay it all out in order once removed you might surprise yourself.
 

Mr.F

Inactive
The water pump in an earlier photo showed some serious signs of deteriation, and the water channels in the block where it mounts was just as bad.

On which basis, can I suggest you replace all core plugs if you haven't already done so...? They will be rusting from the inside out...
 

rhanagar

Well-Known Forum User
The insides of the water channels have a nasty layer of rust on them. I have managed to get a long wire brush in there and cleared most of it out now. I just dont like the idea of rust in engine internals. I think I will get the plugs changed Mr.F It has been preying on my mind to be honest. Am I right in saying you tap in the middle with a drive and then hammer on one side with same drive to spin them and pull out. Then the new ones hammer in with a socket the same size as the depression until its in place. Also using a bit of blue sealant to make sure it's properly sealed.
 

rhanagar

Well-Known Forum User
Could you not use that caravan :D

If its the neighbours just don't tell them ;)

The caravan is mine ... and it does have heating, and gas hobs for the kettle. You know it may be an idea, apart from the frown I got from the missus when mentioning it.
 

Mr.F

Inactive
Am I right in saying you tap in the middle with a drive and then hammer on one side with same drive to spin them and pull out. Then the new ones hammer in with a socket the same size as the depression until its in place. Also using a bit of blue sealant to make sure it's properly sealed.

Pretty much exactly that...do it!
 

Wyn

Club Member
The caravan is mine ... You know it may be an idea, apart from the frown I got from the missus

Simple then :)
Tell her its the Kitchen table or the Caravan :D

Watch you don't get told to go live in it aswell tho lol
 

rhanagar

Well-Known Forum User
Watch you don't get told to go live in it aswell tho lol

She said caravan! .... then she laughed out loud at your suggestion then said I can live in it as well :unsure:

Oh well at least I will be living closer to the Zed ... and will be able to look at her out of the window.
 

rhanagar

Well-Known Forum User
Pretty much exactly that...do it!


That I will :D

Nissan have them in stock near me as well ... only 76 pence each. That sounds like a good tenner to spend for peace of mind. Out of interest if the holes are a tad rusty should I just run a piece of fine sandpaper around to smooth them off to get a good seal.
 

Mr.F

Inactive
Clean up the holes to get a good seal, but not too enthusiastically (no Dremels or files!). Make sure the drift for setting them in place is a good fit - too small will distort the plug and possibly lead to them popping out under pressure.
 

rhanagar

Well-Known Forum User
Ok ... thought I would stop being a girl and went outside while it was still light and start looking at the manky valves. They were pretty bad, and I seriously thought I would be looking at replacing the lot of them. Anyways I started with the Inlet valves as they seemed to be the better of the lot. After some careful grafting and a good couple of hours I ended up with this result. The image in the top right of each picture is what they looked like before.

Inlet-Valve-Bottom-Before-After.jpg


Inlet-Valve-Top-Before-Afte.jpg


Now the tops weren't too bad to be honest and only needed a quick rub over and clean, but the bases as you can see were pretty damn scanky. Needless to say I think seeing as all of them are like this now I did a good job and saved myself quite a few pennies.
 

rhanagar

Well-Known Forum User
Once again braved the weather today. Its getting a bit nippy out there, and working in the garage is fine apart from the lack of heating. My toes fell off half way through todays job which was the exhaust valves. Think I did a good job considering what I had to start with. Anyways a couple of pics for you. Not much for 5 hours work (including the occasional dive inside to warm up a bit and grab a cuppa) but worth it. Hopefully when the heads go away to machined they are good enough to be machined as well and I don't have to replace them. One did have a little nick in the face and I noticed a bit of surface corrosion on a couple of the stems but that was below the guide area. Might be able to get them machined out smooth hopefully. Anyways your opinions on wether they are any good would be appreciated.

Exhaust-Valve-Top-Clean.jpg


Exhuast-Valve-Bottom-Clean.jpg


Enjoy.
 

MCMLXXXV

Well-Known Forum User
look at them valves, beauty!

weather is pretty crap to be working on cars tbh

I just cleaned my garage after all the mess made doing the front coilovers

tomorrow another mission!
 
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