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| Rehabbing a motor that lost oil pressure https://www.slantsix.org/forum/viewtopic.php?t=57602 |
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| Author: | Reed [ Fri May 01, 2015 9:40 am ] |
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If it were my car I would roll the dice. But it belongs to someone else and is their daily driver. I am going to replace the rod that had the bearing disintegrate. I am also going to carefully inspect the rest of the motor, including cutting open the oil filter. I the filter has no grey matter in it, then I will cross my fingers and hope the bearing material stayed in the pan. |
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| Author: | SpaceFrank [ Fri May 01, 2015 10:10 am ] |
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If you're replacing a rod, you may want to get your hands on a postal scale and make sure the total mass of the rod/piston/wrist pin is very close to the others. |
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| Author: | kesteb [ Fri May 01, 2015 9:00 pm ] |
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This sounds like a time versus money problem. If you have no time you need to throw money at the problem. If you have no money then you need to take the time. In your case I would buy a rebuilt engine if I had the money. Otherwise I would do a quicky overhaul. Use the crank kit and the rods as they are. Run a bottle brush glaze breaker thru the cylinder bores and use cheap rings that will set quickly. Replace the cam bearings, oil pump, timing chain and rebuild the head. This will get her back on the road with the least down time and money. After this is done. Then take the spare engine and do a complete rebuild. When it is done, do an engine swap. |
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| Author: | Reed [ Fri May 01, 2015 10:02 pm ] |
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Definitely a time vs. money solution. I have minimal time to do the swap, she needs the swap done by the end of the month. Budget is small. I am hoping for a one-and-done solution, but your advice is sound. When I get the time I am going to tear down this motor and look at it more closely. Reusing old head, I have used good oil pumps, new timing set in a box somewhere, I have a bottle brush hone. Any downside to reusing the rings that are in the motor now? |
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| Author: | slantzilla [ Sat May 02, 2015 5:13 am ] |
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Yes, if you hone the cylinders there is a really good chance they will not reseat. |
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| Author: | DadTruck [ Sat May 02, 2015 6:08 am ] |
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Quote: hone the cylinders there is a really good chance they will not reseat.
for what it is worth,,, the motor guy that I work with , Ed's Machine Shop in Mooresville IN,, put it to me the other way,, Ed said,, that the best way to get re used rings to seat is to run a flex hone through the bores to restore the cross hatch. perhaps the difference is the bores on the engine I am working with are really smooth, very little of the OE cross hatch remains and Ed was speaking to restoring the cross hatch and Dennis was speaking to using a stone hone that would smooth the bores further. |
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| Author: | Reed [ Sat May 02, 2015 9:26 am ] |
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Given that a set of new Sealed Power rings is only 40-75 dollars, I think I will go ahead and just get new rings and run the bottle brush hone through the cylinders (provided the bores check out OK). |
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| Author: | wjajr [ Sat May 02, 2015 9:57 am ] |
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For what it's worth, gen III Hemi engines are made in Mexico, and those seem to fair alright. |
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| Author: | Reed [ Sat May 02, 2015 11:12 am ] |
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Quote: For what it's worth, gen III Hemi engines are made in Mexico, and those seem to fair alright.
Huh?
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| Author: | sandy in BC [ Sat May 02, 2015 11:46 am ] |
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....cookies in the browser.... |
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| Author: | cpslntdchrg [ Sat May 02, 2015 12:10 pm ] |
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Quote: For what it's worth, gen III Hemi engines are made in Mexico, and those seem to fair alright.
I think wjajr intended to write this in the "Which Oil Pump" topic...
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| Author: | slantzilla [ Sat May 02, 2015 4:14 pm ] |
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Quote: ....cookies in the browser....
MMMMMMMMMMM, cookies.  John, we used to reuse rings in the old 900 Kaw motors all the time. We just stuck them back in the holes, no honing at all. I even put in a piston that I dug out of the dirt in a buddy's back yard once.  Let's just say it might not have sealed real good, but it ran for quite awhile.
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| Author: | Reed [ Sat May 02, 2015 4:31 pm ] |
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Well, I think the issue has been settled. I am going to take the engine currently in this lady's Dart that is running with a knocking rod and drop it off at a machine shop. Because she needs a reliable daily driver, I don't want to give her a motor that might have problems due to bearing material having run through the oiling system or some such. I don't want to do a half-assed rebuild and just throw together a running motor from parts I have on hand. So, her motor will be professionally rebuilt, my motor (the one that has oil pressure and bearing failure) will be kept by me to be played with since I am more equipped to deal with an engine problem than she is. I think this is a better solution all around. Provided the machine shop can get the rebuild done in time. i will save honing (or not!) and cleaning out the oiling system on this other motor for another day. 
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