![]() ![]() Synthetic oil's tolerance for higher temps should help with the vaporization and varnish. The more vaporization there is of the motor oil, the more likely varnish accumulates on every internal engine surface. My thinking is the varnish reflects the vaporization of the motor oil as in the "tests" Project Farm runs on YouTube. When the oil has been changed, I suspect your truck saw a lot of "house blend" bulk oil without too much discrimination re viscosity or type i.e. They left the techs to make the decisions about what products to use. I will add a picture to the thread.Ĭlick to expand.I suspect the PO knew little about required maintenance, and/or not too conscientious/particular about the truck's maintenance. The new tensioner has a slightly larger oil port than the old one. ![]() In regard to the tensioners - they seem to be designed to ratchet out to a firm position and after that, the oil pressure allows the plunger to move slightly in and out (mine was stuck). This job is a Pain and I would much rather be changing timing belts in the 4.7 2uzfe engine which is one of the best engines ever built IMO (along with Chevy 4.3 V6 Vortec). Not sure yet why the engine is so varnished and had some sludge - there are two rather large gaps in maintenance records from the previous one-owner. Once I figured out the timing marks it wasn't too bad a job but time consuming. Second Edit: After all said and done, engine is much quieter and is not making the rattling noise, which was happening all the time. Also slack was just due to how it was rotated. ![]() So, why is the slack on the opposite side of the tensioner for the longer chain? Is the timing off? Should I just remove the cam gears to do my riser sealant, and then worry about the timing later, or should I mark them as they are before removing?Įdit: disregard for now, thought it was at TDC but guess not. ![]() The Driver's side is tight which is opposite of what I expected based on youtube videos and other forum posts on this subject. There is slack in both of the passenger side timing chains. Posting this in General discussion due to engine specific and not year specific question. On a mission to get rid of the rattling noise and reseal my camshaft towers. ![]()
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