The 'N/A Project'

Hello,

As opposed to fitting a new engine to cure my oil leak and power loss problem I am going to strip my 2.5 N/A down over Summer and learn a bit more about how my car works. I am hoping to remove each piston from each cylinder, check the bores and then fit new pistons where necessary with new piston rings all round. I am also going to fit a new timing belt and new gaskets all round.

Before I start planning and budgeting for this "project" I would like to ask a few questions just to make sure that I am going about it in the right kind of way.

1) After removing the cylinder head, do I only need to undo the two bolts that hold the con rod onto the crank shaft in order to knock the pistons up and out of the cylinder block?

2) Is there anything such as play / movement in any of the piston components that I should be looking for in order to replace?

3) Is there only one size piston for my engine or do I have to be careful which size I go and buy? I do not plan on a rebore - just honing at most.

4) How do I know which size piston rings I will need in order to fit to my pistons?

Also, does any body know of a web site where I can buy four new pistons complete with rings that I can just drop in to replace my existing pistons?

Thanks in advance for any help. I'm quite looking forward to doing it, but I really want to know that once I get started, I'll be able to finish!

-Pos

Have you thought about downloading A workshop manual and having a read of it?

It's a bit more complex than just popping 4 new pistons and rings in. why are you changing the pistons unless their cracked why not just replace the piston rings. but you'll need to know if it has had oversize rings fitted.

Cheers Red, how do I tell if it has oversized rings? I will only change the rings if that's what's required. I will have to take the pistons out to do that though will I not?

and depending what yu find when yu take the lid off - it might need reboring or a bigger size piston.

I thought yours was a td 19J???

Yep you need to take the pistons out you'll also need a internal bore micrometre or a large micrometre. to measure the pistons. but you'll need the manual in order to know the exact sizes required. what your planning is easy enough to do if you have a manual. So you 1st job is to download one ASAP.

can they be downloaded from here?

Odene - it's a 12J N/A

Do a search on here for the link it's been posted loads of times or google "landrover manuals"

Before I start, is there anyone who has a recon / non breathing N/A that they are willing to sell? I like this engine - not bothered for a 200 / 300 or 19J

Wot do ya mean non breathing???

Not breathing sorry - non oil spitting that doesn't blow a ton of oil out of the top (ie. new piston rings)

Have a word with Sean he's allas nicking em. an flogging em on.

i fink he means a goodun.

Yes I'd like a goodun =) I shall pm Sean

Can I fit a cylinder liner? I don't understand what they do or how they are held in place.

no.

pos said:

1) After removing the cylinder head, do I only need to undo the two bolts that hold the con rod onto the crank shaft in order to knock the pistons up and out of the cylinder block?

Click to expand...

They go down... Sorry yes they go up - I forgot the block I was looking at was upside down on an engine stand!

pos said:

2) Is there anything such as play / movement in any of the piston components that I should be looking for in order to replace?

Click to expand...

Yes

pos said:

3) Is there only one size piston for my engine or do I have to be careful which size I go and buy? I do not plan on a rebore - just honing at most.

Click to expand...

No - if you were to get the bores done, you would get oversized pistons and rings - if this has already been done it should be marked on them already.

pos said:

4) How do I know which size piston rings I will need in order to fit to my pistons?

Click to expand...

Above

pos said:

Also, does any body know of a web site where I can buy four new pistons complete with rings that I can just drop in to replace my existing pistons?

Click to expand...

What makes you think you need new pistons?

pos said:

Before I start, is there anyone who has a recon / non breathing N/A that they are willing to sell? I like this engine - not bothered for a 200 / 300 or 19J

Click to expand...

Hybridgirl has one sitting on my workshop trolley ..... how much are you offering? It's a known good runner ready to pop in, but needs a starter motor.

CharlesY

I look forward to seeing Landy pistons being removed downwards.
It must need a HUGE hammer to get them out.

It's going to be a heap of fun getting them back in from below too!

CharlesY