dave's.cavy's old engine

[angryman]

For those of you who don't venture onto VxON, thought i'd copy across my WIP thread on this.

Purchased Dave's knackered C20NE for the pricely sum of £10 and a pair of headlights (blown headgasket and running probs)

He took it to bit's for me so as I could get it home.

I've taken some pics as I've started work, but didn't take any of the head before as I didn't know i was going to do this

Basically it looked like this (pic courtesy of LSI)



Stripped the head down keeping the hydraulic lifters in order along with the valves

I then used Alloy wheel cleaner and a small paint brush to clean the head up.....I wouldn't like to use that stuff much on wheels

The following pics are of it cleaned (might do a bit more yet) and polished,to a point.












I plan to have a go at porting it and will post updated pics

Generally the head is in very good condition with no signs of corrosion on the mating surface. Last operation will be to give it a light skim.

It measures 95.3m overall. Original height should be 96mm +/-.25mm so technically it's only .45mm down on original spec

Pics of the block etc to follow when i get my engine stand:p

[angryman]

I stripped the lifters down ....quick guide how to do it.........

[Look at the captive ring around the top part of the lifter and you will see two dimples.
Carefully with a small flat bladed screwdriver prise each side of the ring up off the lifter body at the dimples (hold a cloth over the whole thing incase the spring inside pops the lot up in the air!)

With the ring off, remove the plunger and small spring from the body.
Clean all parts in brake cleaner or similar ....soak overnight if needed
If any part is clogged with old oil careful scrape it out making sure you don't scratch the lining or body of the plunger

Pour just enough fresh oil into the body to cover the bottom part.
Locate the spring onto the bottom of the plunger and oil lightly

Insert the plunger into the body.
Offer the captive ring onto the body and with finger pressure press the ring back over the body until both sides click into place.

If you can't compress it enough, close it down gently in a vice until the ring clicks on.
You shouldn't be able to compress the plunger by hand if you have enough oil in there.

Either immerse in a pot of fresh oil for a while or if you have one ,use a small syringe to force some oil into the hole in the body (*note....don't go and pick up some old junkies used needle to do this* )
Doing this will prime the lifters and you should get a smooth start up and no or little initial rattle]

Re asssembled them all and put them in bags along with the followers all numbered.

Next was the valves.

Cut a block of wood and drilled some 7mm holes in it.
Put the valves in the wood and numbered them 1 to 4 inlet and Exhaust

Discovered one of the inlet valves hadn't been sealing properly and this co insided with the cam follower underneath being dull instead of shiny, suggesting the hydraulic lifter hadn't quite been doing it's job

Held the valves in turn in the lathe at work and used 80 grit emery cloth to get the crud off, then worked my way down to a bit of wet n dry






Next job is to lap all the valves in.

[angryman]

Update

Started to lap the valves in (borrowed a lapping tool from http://www.ratrace-motorsport.co.uk/ now in Potters Bar) a couple of units down from me as mine has gone awol:doh:





Have done all of them now and will stick a pic of them up over the weekend.

First pics of the block...............









Picking up an engine stand next week then can get cleaning

All this is being done where I work, tucked away in the corner.......boss grumbles a bit, good job he doesn't know the extent of my spare parts department stored there as well

More to follow......

[angryman]

Well progress has been slow due to actually having to do some work pppffffttttt

However first bits to arrive towards the re build ......new belt cover, stem seals and a cleaned up rear pipe (cheers dave's.cavy )




Waiting for belt tensioner, and the stoopid cover didn't come with any clips ..if any one has some going spare donations are gratefully accepted

Still polishing the head

Getting the engine stand Sat, then the block cleaning begins!

Boss starting to grumble more lately...............dunno whylmao

[angryman]

Here we are again

I've done some more polishing to the chambers, but still more to do

Made a start on the porting of the inlet side.

Marked round the old gasket and started to rough away the metal with a Burr, keeping to just within the gasket (middle one in the pic)



When I've got the shape done i'll smooth the insides.


Another new bit...i'm feeling the tension now




Aaaaaaaaaannnnnnnnnnnnnnd















Ta Da!!

















A free engine stand











There does seem to be a bit of a lip on a couple of the bores, but i'll polish them out. I'll measure the bores tomorrow and see if there's any wear


Whilst I'm on the scrounge, if any one has a spare ribbed crankshaft pulley they'd like to throw my way (no, not at me!) or any other bits It'll be much appreciated

[Envoy CDX]

Taking your time ain't ya Leon..
But seriously, looking very good.

What benefits is there from a polished and ported head - sorry if I sound thick

[Squig]

Reduced turbulence in the airflow into and out of the engine hence smoother flow hence quicker to get more of the fuel air mix in hence more bang.

the smoother the better... to a point... and no point in polishing exhaust to much as carbon build up will reverse some of the work done anyway.

[angryman]

Wot he said ^^^:D
I've done the inlet side, but not high polished as it's only flow.
No need to match the exhaust side as the ports are smaller than those on the manifold..just take out any rough edges
I'll do pics when i've done it

[angryman]

Well, here we are again!



The head is now ported,polished and painted



New valve stem seals fitted and a 3 thou skimmeroo!


























Can now start cleaning the block up

[Gaz]

im impressed, ive had my head done professionally but ive gotta do my bottom end soon so get some pics up so i can get a good idea if im doing something i shouldn't

[Squig]

pure engine porn if ever I saw it! fancy doing mine

[angryman]

pure engine porn if ever I saw it! fancy doing mine

You're not the first to ask!

i'm looking to price this work up

[angryman]

Moving on a bit now....block is nice and clean.....will update pics when painted...don't want to bore you too much



I was BAFFLED how to get the sump off....didn't realise it was in two parts

Sump off....



Eeeeeerrrrrrrrrgh






Hmmmmmmmmmm..................








Aha!................






Absolutely no bits in there and quite spotless......Dave, did you have it off before (ooeeer missus!)





My bottom.................

Again, spotless......no crud, old oil, nuffink!













Turns by hand nice and smoothly......no sideways movement in the pistons


I'm really not sure how far to go with this as budget prevents spending loads.....can still get a couple of bits from my garage, but don't want to push my luck!



I reckon left to get:



New rear crank seal


New water pump


New oil pump to block gasket


New front crank seal


New sump gasket


New oil pick up pipe 'O' ring


New Cam front/rear seals


Ribbed belt crankshaft Pulley



I'll take a piston out and check the big end bearing on it, but am reluctant to touch the rings



I measured the bores and they came in at 86.01mm against the book size of 85.98mm for standard pistons

[Envoy CDX]

Will it bore out to 2.1 or 2.2 and you can get some Chevette pistons in there?

[angryman]

Will it bore out to 2.1 or 2.2 and you can get some Chevette pistons in there?

Easy Tiger, it's staying as it is!

[dave's.veccy]

That nice and clean from when i last saw it

Ive never had the sump off it but i have no idea what the last lemon, i mean owner had done to it. He'd done all sorts of crap to it, even bodging a switch in the fuse box (now removed) for the rad fan because the headgasket issue, oh it had no thermostat fitted in it either

the crud in the oil pickup may explain a few things with the oil pressure gauge mind