so ive been using oil lately a lot so i looked down the tb and low and behold my plenum is covered in oil... so it looks like when it warms up enough ill be replacing my plenum. so heres my question. im tearing down the engine this far is there anything else i should replace while im at it? i want to switch to mobile one synthetic oil too. i want to know what seals i should replace to compensate for the synthetic switch. since ill have it torn down that much should i replace the timing chain and sprockets?

98 5.2l with 145000 miles on it

 

Here use this kit. That way you have an all aluminum intake instead of aluminum with the the steel plenum. The only thing I replaced that the kit doesn't include are the injector o-rings and valve cover gaskets (pulling the valve covers is not necessary but I wanted to paint them and they were starting to leak). As far as the timing chain goes I wouldn't worry about it. You only have to disconnect the alternator and simply move the a/c compressor off to the side. If you want to get to the timing chain the water pump must come off as you know so its up to you. If you were ever planning on doing a performance cam now would be the time then I would replace the timing chain.

 

That's the kit I plan to use. What engine seals besides those could synthetic cause to loose oil? Oil pan I suspect


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Yeah oil pan could definitely leak, how many mile are on your D?

 

145000 but I've always been suspicious of the engine. Its got grease pen on it so its a salvage engine so the actual miles may be different



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I would not worry to much about leaks .... I put synthetic in back in September with the truck at around 157,000something and still have no leaks.

 

Ok



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What about washing the engine compartment? Best way to do that?


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Pressure wash. Cover stuff you don't want wet. Air cleaner for example. Coil and cap seem to seal them selves. Or pull air cleaner off and wrap TB with plastic. I have an old coffee can I use. I use Purple Power or foamy Engine Brite. When done with work go back rinse off spray with armorall type product. I do a final rinse to get rid of stickkyness of armorall.

 

What we do where it worked is we had this yellow Safety Kleen brand general degreaser and sprayed that on, let it sit for like 3-5min, then pressure washed it. We had a heated pressure washer and always soaked everything, unless it had an exposed air filter or other things that shouldn't get wet. We never had an issue. Now I did once because of the plug heat shields on my motor. They filled with water and cause misfires but once dry didn't have an issue. Now I always use di-electric grease and that solve my mis-fire when motor soaked.