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| hydraulic lifters-how to preload them? | |
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| Tweet Topic Started: Tue May 15, 2012 7:54 pm (548 Views) | |
| mchell | Tue May 15, 2012 7:54 pm Post #1 |
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hello received today my 12 hydraulic lifters fo my 2.6 auto. Thinking that they would need to be pre loaded, i depressed the little sphere in one of them and suddenly saw oil in the bottom! so apparently they came pre loaded with oil. my question is them, how do i pre-load just the one i unloaded? do i need to do it anyway, since the oil will get to it after i start the engine, or will this produce a initial wear that will 'kill' this lifter? cheers |
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| Big Ben | Tue May 15, 2012 8:45 pm Post #2 |
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Sneaky 2.5-16 Driver!
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No need to pre load the lifters. In fact one of the things you must do when replacing used or new is compress them slightly as you did to allow them to naturally fill with oil to the correct level when you start the engine. It may clatter for a couple of seconds but will then settle down to be the quiet engine we all know and love! |
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| mchell | Tue May 15, 2012 9:10 pm Post #3 |
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ok thanks big ben. I just thought i had screwed things up! so no is just to fill them up with oil before placing them in the rocker arm. One other aspect of this procedure that raises concerns to me is the torque settings of the camshaft bearings bolts. The maintenance sheets say that its 21Nm and I have a torque wrench, beam type, that allows for some lower end torque to be measured. but anyway, none of the torque wrenches out there are that precise. so how do I proceed to not create any imbalanced stresses along such long camshaft (or worse, to start finding that the bolts were not tightened enough by fear of over tighten!) Any advice on this would be also appreciated cheeers |
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| Gerry Lloyd | Sat May 19, 2012 2:47 pm Post #4 |
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Monsieur
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You were lucky to get pre-primed lifters. A set I bought were not so and made quite a racket when I first ran with them. The noise did not clear before I removed them again and returned to dealer. A bit naughty but glad I did it because my old ones are running fine 2 years on. All I'd needed was some new oil (didn't realize at the time that my headgasket was going and water was degrading my oil's lube value). By the way, the lifters are designed to lock in once pressed home so if you try to take new ones out again, their tin collars get ripped and it makes a mess. Re. cam bearing bolts, I had an adventure with mine. The first time I took them off I put them back by feel and later found they were very close to spec. But then, being the wise guy the second time I took them off, I used a typical 'ebay quality' torque wrench to tighten them "properly". The wrench was working ok at moderate torques but I discovered it wouldn't click for the low torques. Being outdoors with chav neighbour making a deliberate racket, I lost my cool and snapped one. It took me a few hours to twist out the lower half of the bolt with a broken hacksaw blade. Since then I bought a decent wrench but it starts about 5nm higher than the prescribed setting. Again, working in darkness and rain, I used that wrenche's lowest setting and all is ok. |
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8:36 PM Jul 11