Re: How to do compression check?
Yes; use them. A Pre-chamber Diesel is designed with lower compression than a Direct Ignition Diesel, which is why they have glow plugs.
Ignition takes three things, fuel air and heat. In a Direct ignition diesel the compression of the fuel and air causes the heat for ignition. In a Pre-Chamber diesel glow plugs are used to gain the heat at a lower Compression. If you have glow plugs your engine was designed to be started with their use. It will start without them usually, but it will be much harder and that is normal.
You can see blowby if you remove the oil cap, you would have exhaust coming out the fill spout. That would be a very good indication that engine has significant wear.
Last edited by IronSpinnaker; 08-04-2012 at 08:30 AM.