mx71 Posted October 27, 2017 Report Share Posted October 27, 2017 I have an 85 z24, and I’m having a leak from the cover behind the lower pulley with three belt slots. What is that? Oil pump cover? Edit...I'm thinking the oil pump is the block bolted to the left of it if you're standing in front of the truck looking in. Could it be the timing cover? 1 Quote Link to comment
racerx Posted October 27, 2017 Report Share Posted October 27, 2017 What does the fluid look and smell like? Get a mirror. 1 Quote Link to comment
datsunaholic Posted October 27, 2017 Report Share Posted October 27, 2017 Your timing cover is leaking. There's an oil seal behind the crank pulley. 2 Quote Link to comment
datzenmike Posted October 27, 2017 Report Share Posted October 27, 2017 Remove crank bolt and tap the back or the pulley with the socket. May take 20-50 taps but it will slide forward and off. Pry old seal out of the cover with large screwdriver. Pound new one in using a large socket and hammer. Install crank pulley and bolt. Torque to 100 ft lbs. 3 Quote Link to comment
mx71 Posted October 28, 2017 Author Report Share Posted October 28, 2017 Is the pulley the only thing I'll have to remove? It appears to be leaking from the bottom corner on the driver's side. Is this something that would benefit form a new gasket set, or should I just RTV it? All day job or a couple hours? 1 Quote Link to comment
kelowg Posted October 28, 2017 Report Share Posted October 28, 2017 Degrease the area. See if u can zero in on exact source of leak. Bottom corner would likely b oil pan. 1 Quote Link to comment
mx71 Posted October 28, 2017 Author Report Share Posted October 28, 2017 Going to degrease and pressure wash today. Must be the only part of the motor I haven't cleaned thoroughly. 1 Quote Link to comment
datzenmike Posted October 28, 2017 Report Share Posted October 28, 2017 Carb or brake cleaner works good. The air from driving will, push oil from a leak far from it's source. I would expect the seal. If you have switched to synthetic, change back at the next oil change and the 'leak' will probably stop. Synthetic is not a good oil for our older vehicles. It's over kill for lubrication on a fresh engine and a waste on a worn one. It will leak past old seals and gaskets where the regular oil will not. The back side of the pulley has a projecting 'nose' that slides over the end of the crankshaft and fits against the seal in the timing cover. Have a care when removing as there is a slot in the pulley to match a woodruff key in the crank to align it. 1 Quote Link to comment
mx71 Posted October 28, 2017 Author Report Share Posted October 28, 2017 Thanks Mike. So I degreased and pressure washed what I think is the source, and no leak yet. Also, I know snake oils are not the way to go, but since it was low yesterday, I topped it off with Lucas engine oil stop leak. I'll be damned if I haven't seen one drop after warming it up after cleaning it this morning, when I saw a drop every 10 seconds yesterday. Maybe it is possible for a snake oil to work? Also, Mike, I'm using Rotella 15w-40. No synthetic for this old thing. Only for my other two vehicles. I use Rotella in pretty much all motorcycles/scooters and anything that didn't cost 50,000 dollars and 15w-40 is within the range of appropriate weight oils, usually 10w-40. 1 Quote Link to comment
datzenmike Posted October 28, 2017 Report Share Posted October 28, 2017 The stop leak uses petroleum distillates that swell seals. I used it on a power steering pump leak on my Charger back in the day. Impressive. 1 Quote Link to comment
mx71 Posted October 28, 2017 Author Report Share Posted October 28, 2017 Well, so much for that. A few drops on the skid plate, but not discernable where from. 1 Quote Link to comment
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