Guest Anselcop Posted January 21, 2017 Share Posted January 21, 2017 I'm a new owner to a 1949 Chieftain that the previous owner of 50 years took very good care of. How would I tell if I need to pull the oil pan to clean the sludge from the bottom of the oil pan and the pump screen? Unfortunately the previous owner passed and I don't have any idea when or if the sludge has ever been cleaned......and, can the oil pan from a straight 6 be dropped with the engine still in the car? Link to comment Share on other sites More sharing options...
RussJagoau Posted January 21, 2017 Share Posted January 21, 2017 Howdy - yes you can drop the oil pan from the block with the engine in situ, as I have done on previous occasions. You may want to try draining the oil from the pan first then pour a ltr of diesel down the oil filler and see what comes out of the oil pan drain hole. Just be aware that early Pontiacs have the oil cleaner inside the oil pan on the intake to the oil pump so dont start the engine to circulate the "flushing oil"otherwise you may well stir up and deposit a heap of unwanted debris in the oil cleaner. For what its worth for an oil pan gasket and a few hours labor, its good insurance to pull the oil pan and the oil cleaner and clean out the 50 odd years of accumulated gunge, as from what I have seen most of these era vehicles havent used detergent oils and the gunge build up can be extensive. 1 Link to comment Share on other sites More sharing options...
Guest Anselcop Posted January 23, 2017 Share Posted January 23, 2017 I think I will take your advice and drop the pan and see what treasures I can find hiding in the bottom of it....thanks! Link to comment Share on other sites More sharing options...
RussJagoau Posted January 24, 2017 Share Posted January 24, 2017 Thanks - pls let us know what you find and even a pic or two of the treasures hidden away in there Link to comment Share on other sites More sharing options...
GARY F Posted January 29, 2017 Share Posted January 29, 2017 so what did you find in the pan? Link to comment Share on other sites More sharing options...
Guest Anselcop Posted February 3, 2017 Share Posted February 3, 2017 A few other projects got in the way; such as a leaking master cylinder and wheel cylinders. So, I'm replacing most of the braking parts over the next few weeks Link to comment Share on other sites More sharing options...
Tim warne Posted June 25, 2019 Share Posted June 25, 2019 Good day everyone, I to am wanting to drop my oil pan with engine in the car but I have a 1954 Pontiac laurentian flathead 6 and am Leary on the clearence from pan to cross post to drop and pull the on out. Anyone done this on the same car? cheers Link to comment Share on other sites More sharing options...
The 55er Posted June 25, 2019 Share Posted June 25, 2019 Doesn't look like a quick simple operation, a detailed procedure can be found in the Pontiac Shop Manual or a period Motor's repair manual. Link to comment Share on other sites More sharing options...
aristech Posted May 21, 2020 Share Posted May 21, 2020 I was wondering if anyone has removed the pan from a 1936 Pontiac 8 and replaced bearings? I have a rod knock and need to replace the bearings. If anyone has done this would like to see some pictures and some instructions on what wold be the best way to go about it. Link to comment Share on other sites More sharing options...
Guest Posted May 22, 2020 Share Posted May 22, 2020 I see no reason why it couldn't be done but I would want to pull the head and remove every piston and rod assembly so I could check the rod for alignment. Maybe you could take the ridge off the top of the cylinder and check the bore for taper. I would also do a compression check before disassembling anything. Also you need to mic the crankshaft to tell what bearing size you need. You can do it cheap now and overhaul the engine later or you can fix what is needed and be done in one trip inside the engine. If you have multiple rods knocking there is probably other things that need to be repaired, replaced, or otherwise corrected such as valve grind and/or rebore. Link to comment Share on other sites More sharing options...
Summershandy Posted May 29, 2020 Share Posted May 29, 2020 I dropped the oil pan in my '54 Pontiac straight 8 engine still in the car. I remember having to be quite creative with a jack and blocks. It was a tight fit but doable. It was nice to change out the gasket and give the pan a fresh coat of paint at the same time. My filter was fairly clean but I did have a good layer of sludge at the bottom. Link to comment Share on other sites More sharing options...
GARY F Posted May 29, 2020 Share Posted May 29, 2020 It doesn't look to dirty. Link to comment Share on other sites More sharing options...
Summershandy Posted May 30, 2020 Share Posted May 30, 2020 15 hours ago, GARY F said: It doesn't look to dirty. That's what I thought and expected worse. 1 Link to comment Share on other sites More sharing options...
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