Guest daz 6576 Posted December 4, 2008 Share Posted December 4, 2008 how can i find out which glow plug has gone on my dads merc. how do you check them. can anyone help please Quote Link to comment Share on other sites More sharing options...
ManwithSupra Posted December 4, 2008 Share Posted December 4, 2008 wrong section dude. You will need to post this in non supra technical My mate works for merc so i will ask him if there is a easy way. What merc is it? Quote Link to comment Share on other sites More sharing options...
Guest daz 6576 Posted December 4, 2008 Share Posted December 4, 2008 its a c250 turbo diesel 5 cylinder auto any help would be mint Quote Link to comment Share on other sites More sharing options...
d-_-b Posted December 4, 2008 Share Posted December 4, 2008 Do you know where the plugs are on the engine, and have you taken them out yet? Quote Link to comment Share on other sites More sharing options...
merckx Posted December 4, 2008 Share Posted December 4, 2008 (edited) On the last van I had it was easy to just unscrew and pull out the injectors a little and to look into the top of the cylinder, switch the ignition on and watch the glow plugs glow. This method also shows that power is being supplied to the glow plugs. Not advisable to do this if it's a high pressure direct injection engine. OR Disconnect the wire going to each glow plug. Connect a test light to the POSITIVE (+) battery terminal and touch the point of the test light to each glow plug terminal in turn. If the light lights, it's good. If it doesn't, it's bad and needs to be replaced. Some diesel engines, Mercedes Benz diesels (My latest van is like this) have a Pre-combustion Chamber that houses the glow plugs. This Pre-combustion Chamber helps slow down the combustion process and aids in cold starting. They do have a tendency to get carboned up and thus rendering the glow plugs ineffective. So when the glow plugs on engines equipped with a Pre-combustion Chamber are replaced, the Pre-combustion Chamber should be reamed out to remove any carbon build up Don't fit cheap replacements, they won't last very long at all. Edited December 5, 2008 by merckx (see edit history) Quote Link to comment Share on other sites More sharing options...
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