Sunday, April 27, 2014

Spare Engine - Valve Lapping Techniques

In the last post I was investigating how to strip the head down and then said I was going to look into porting to get better flow. But after a little further investigation of the head, I have decided to delay the porting in favour of making sure that the valve seats are lapped properly. Once I know that they are air tight, then I will move onto porting.

I currently have two heads that I am working with, however I soon noticed that one had a rather nasty crack across one of the valve seats. A closer inspection confirmed that the crack extended into the valve port and across the gasket face. So that's one head declared dead, destined to be nothing more than scrap or maybe a door stopper. Before that though, I will use it to practice and hopefully perfect my porting techniques.

Sunday, April 6, 2014

Spare Engine - Head Inspection

As the strip down of the engines continues, my attention now turns to inspecting the heads. The better engine came with complete head and rocker assembly, whereas the 'not so good' engine's head came minus the rockers. Looking at the casting numbers, both the heads are of identical spec and designed for a 99H engine.

Two heads really are better than one. Having a 'spare', 'spare' head is exceptionally useful, even though it's not in the best condition. As I have no experience what so ever in this area, working on the 'spare', 'spare' first, allows me to get away with mistakes while gaining valuable knowledge that I can use when working on the 'good' head.

Saturday, April 5, 2014

Valve Spring Compressor

Having collected two spare engines recently, I've been slowly taking them to bits in order to assess what needs to be done in the hope of making a good one from the two. Having already looked at the block, now I turn my attention to the head. Anyone who has ever taken a head to pieces will know that to get the valves out, you need a valve spring compressor.

How to get those tricky valve springs off!

Tuesday, April 1, 2014

Spare Engine - Block Inspection

Having acquired not one, but two spare engines recently which you can read about here and here. I needed to have a look at them and assess what kind of state they were in to plan what I was going to do with them.

One of the engines I bought on the cheap, having a cracked block is no good for a rebuild, but I will be useful as a learning engine and also for spare parts. This post however will focus on the 'good' engine that I hope to dismantle and rebuild.