i have an L16 that has a dead cylinder. my neighbor's boyfriend said he could get a hold of another head that has been ported and polished. what other things need to be done if this head is different from what I have?

I'm going to have the engine yanked because there's an oil leak, and a buddy of mine may be able to do the rebuild for me. the engine's gonna have to last me a while...

not being smart here I just dont know. I know a L-20 but not a 16

An L16 is an "L" series 4 cyl, just like the 4 cyl L20, but with, you guessed it, 1.6 litre displacement.

there was a 6 cyl L20 also just to get confusing.

Originally posted by beandip

not being smart here I just dont know. I know a L-20 but not a 16

The L16 never appeared in a Z, it is one that was standard in the "Bluebird" or "510" Datsuns. Basically 2/3's of an L24 if you want to look at it that way.

Could you guys shed some light on what is involved in a light rebuild as he originally posted as I'm also curious..:classic:

My l28 burns a bit of oil doesn't leak it so I have the feeling the oil rings are gone on 1 of the cylinders. It runs hard and fine just eats a bit of oil, I've tried thicker oil for older engines helps a bit not heaps.

I think the engine is in good condition for the most part it still gets good oil pressure.

Not sure what HE means by a light rebuild, but if I used that term, I'd mean just rebuilding the cylinder head and replacing the timing chain, gears, and tensioner. (maybe the oil pump and water pump too)

If I started replacing the piston rings and the rod, and main bearings, and the rear main seal; I'd call that a major rebuild.

Just my $.02 USD

Carl

Carl that's a very good point......

I'll probably plot around in my L28 N/A until I build up the Turbo P90 project.

It may also be the valve stem seals that are stuffed. I notice if the car idles for a while and I give it a little rev then I get the puff of blue smoke is it more likely to be valve stem seals or rings in this situation?

Thanks again.:classic:

Originally posted by Gav240z

It may also be the valve stem seals that are stuffed. I notice if the car idles for a while and I give it a little rev then I get the puff of blue smoke is it more likely to be valve stem seals or rings in this situation?

Gav240z:

I'd think that seals would be more likely to be the culprit, though I am by no means an expert. ZmeFly, and others who actually earn a living working on cars may have differing opinions on this, and I'd of course defer to them.

Carl

A light rebuild to me would be new rings, bearings, gaskets, and reseat the valves. Which is what i have planned for my car.

Originally posted by Mr Camouflage

A light rebuild to me would be new rings, bearings, gaskets, and reseat the valves. Which is what i have planned for my car.

So what do you do for a MAJOR rebuild? A light rebuild and Paint the block?

A light rebuild to me is a hone, new rings bearings etc, where as a major rebuild is a rebore, new pistons, all balanced, new hardened valve seats, new valves and cam etc.

To give the opposite view as a mirror to this discussion. I believe if you do a Heavy (or full) Rebuild, includes the added machining tasks of Line Boring, Decking, head full re-work(surfacing / shave new guides line bore and such. You also have the added block preps seed blasting de-burring, acid dipping and repair welding as required and possible blueprinting maybe even dynamic balance depending on your application. Then you have resizing of rotating bearing surfaces and grinding/polishing.

The short answer, it is like "Z KID" says a light rebuild is any build that does not require any more than minor head rework hone rings and bearings to get you going.

Go the P90, its the winner.

my 2c

Steve :classic: