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Re: diesel compression -opinions?


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Posted by trucker 40 on July 14, 2011 at 16:39:49 from (69.152.36.76):

In Reply to: Re: diesel compression -opinions? posted by Tony in Mass. on July 14, 2011 at 10:05:41:

I know what you are saying about the oddball stuff nobody knows about,but then that makes you drink a lot more beer!So if you didnt have the chain off,and if you rotate the engine until both valves on number one rockers are loose,with piston all the way up,mark a spot on the harmonic balancer and somewhere thats exactly lined up to it on the front of the block there.Also while doing this,see if the dowel rod works.It will be a big plus if it does.Then adjust the valves like it says.As you do a valve turn the crank completely around 2 times,and line up the mark you made, and do the next valves in the firing order if the rockers are loose.Then once you get the valves set,try your compression test again.
I dont care where you get your parts from,especially nowdays,you have to check the ring end gaps.Its easy to do.First you find out what they are supposed to be,and then you put a ring in the sleeve,then you get it square by putting a piston in part way and getting it equal all the way around,then check with a feeler gauge and see what you have.Its just what you do when you build an engine,any engine.There have been cases where they put the wrong rings in an overhaul kit and the only way you know for sure is to check your end gaps.
I seem to get the idea that you are right frustrated and maybe feeling like junking it.Well dont do that!I would never let any machine beat me.None of the mechanics I know would either.You just stay after it,whatever it takes,until it runs and pulls itsself out of your shop!I know you can do it.Ive seen your work and it looks good.
Now if when you have the valves adjusted and if you turn it until the number one rockers are loose,and if the dowel goes into the hole,and you get the pump on,and you have high enough compression,and it pumps fuel,it should run.Now as far as an old diesel having low compression and having to use glow plugs to start it,I doubt thats right.It takes compression in a diesel to even fire the fuel.So it is going to be up there,and its no joke.I read where it needs at least 350 pounds of compression,and like others told you,it needs compression to run and 350 sounds a little weak,but maybe since the rings arent seated.
Now,drink appropriate amount of beer,slap your face a few times,get mad,and fix this beast!Dont let that machine beat you!You make the machine do what you want,not let the machine beat you! Good luck!
Tell me if you still are having trouble after you get that far.Now you dont think that there is any foreign material like a wire or a rock or something between the head and block do you?Ive had something slip in there when putting a head on by myself and keep from getting compression on a diesel.You might want too look things over real close and see if you see anything obvious like where the compression might be going,if it is.
The bottom line is that somebody built this thing,it ran,and if they can do it,you can do it!


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