Herman109 Posted June 17, 2013 Share Posted June 17, 2013 I've got a 109 with a 2.5NA diesel engine. Recently I changed the headgasket because off an oil leak between head and block. After assembling the whole engine together it produces an ticking noise like the tappets are not adjusted properly. What I've done so far: - new headgasket - re-surface head - new hotspots (after re-surface head, they just stick above the head) - all head bolts set to right torque (and re-checked after some driving) - tappets adjusted (several times) - new injectors - injectionpump slightly retarded because off blake smoke on full throttle The noise seems to be produced by the tappets but I've adjusted them for at least 3 times (0,25mm). Does anyone have an idea what this ticking noise can be? To exclude noises I gave the throttle a blimp an direct shut off the engine. I assume there is no injection after shutting off the engine. The ticking noise was still there, so it has to be a mechanical sound and has nothing to do with injection?! Quote Link to comment Share on other sites More sharing options...
101sean Posted June 17, 2013 Share Posted June 17, 2013 Leaking exhaust manifold gasket? Quote Link to comment Share on other sites More sharing options...
Aragorn Posted June 18, 2013 Share Posted June 18, 2013 yep, exhaust gasket can often sound like tappets. Quote Link to comment Share on other sites More sharing options...
Simon Smith Posted June 18, 2013 Share Posted June 18, 2013 Wear on the rocker arm pad? sometimes the feeler gauge will bridge across a groove worn in the pad by the valve stem, so you have a bigger gap than you think. Quote Link to comment Share on other sites More sharing options...
Herman109 Posted June 19, 2013 Author Share Posted June 19, 2013 Thanks for replying, @ 101Sean and Aragorn, I will check the manifold gasket for leaking. When I fitted the manifolds I used a brandnew gasket but probably it doesn't make the exhaust manifold leak-free. Is there a methode to check if the gasket isn't right? @ Simon Smith, During assembly off the head and head-parts I checked everything on wear. The rockers had no or very little axial freeplay en where not worn at all. Between rockerarm and valve stem there are little valve stem caps. None off them where worn and I re-used them. But I will check them as well, cause I don't want the ticking noise anymore. Quote Link to comment Share on other sites More sharing options...
Aragorn Posted June 19, 2013 Share Posted June 19, 2013 Perhaps use a piece of hose as a stethoscope, and use it to "search" around the manifold area for the noise? Quote Link to comment Share on other sites More sharing options...
elbekko Posted June 19, 2013 Share Posted June 19, 2013 Are the injector mounts tight? I had a ticking on my 300TDi, turns out the injectors were still loose after tightening to the correct torque (probably dirty thread). Quote Link to comment Share on other sites More sharing options...
RustyNissanPrairie Posted June 19, 2013 Share Posted June 19, 2013 Is there oil to the rocker area? I seem to possibly remember something about the external oil line possibly causing an issue? Quote Link to comment Share on other sites More sharing options...
zeerover Posted June 28, 2013 Share Posted June 28, 2013 A broken piston. Quote Link to comment Share on other sites More sharing options...
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