As VW Trends says above, it is good insurance about every valve adjustment or so to check the lower four head nuts (the only ones you can reach with the engine in the car).Ī Short Primer on Torque Wrench Operation
New heads in the US are about $120-140 each (2006 prices), and even cheap cylinder/piston sets are about $100. In this case, an ounce of prevention certainly IS worth a pound of cure! The usual result of prolonged loose head bolts is leaking combustion gases at the head/cylinder joint, which burns the heads out and usually the top of the cylinder too - bin jobs for both. Since there is no head gasket to allow for any slack, it's more important in a VW engine than most others. If it stops one minor problem from becoming a bigger one, it would be well worth the extra time and effort.īob Hoover and a few others recommend retorquing the heads every time you have the engine out, just as insurance. You were going to set all the valve clearances anyway, so what's four more nuts? I will also recommend that if you are running more horsepower through a cam, headwork, bigger cylinders and pistons, or more compression, it becomes a mandatory routine. I'll go out on a limb here and suggest that maybe every other valve adjustment or two, take the rocker arms off and check the lower four. The common denominator here seems to be that, if the opportunity presents itself, it is a good idea to at least check the bottom, easy-to-get-to head nuts, and if you are running anything other than a stock 1600cc engine, then it should be done with more regularity. The editorial summarizes their survey with the following. About six "experts" are quoted half of them say that re torquing of the head nuts on a stock engine is not necessary, the others say it is. There was an editorial in a past issue of VW Trends about torquing the cylinder heads nuts. Here we will primarily discuss torquing of the head nuts. Rob's 2019 note: Here's one of Bob Hoover's great blogs on cylinder heads.I'll let you look around the site for more. Bob Hoover has prepared a couple of excellent treatises on these subjects, ”New Heads” and “Head Job” (unfortunately these articles are no longer available on the Internet). Note: Our experience did not include replacement of the valves and rebuilding of the heads. Wisdom of Bob Hoover Regarding Push-rod Tubes.Miscellaneous Correspondence Regarding Cylinder Heads.A Short Primer on Torque Wrench Operation.To go directly to your topic of interest, see the following links.
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