04-05-2021, 09:38 AM | #1 |
ALWAYS-N-BOOST
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1987 Buick Somerset 3.0L Engine
**Question** I just scored this low mileage(63K) 1987 Somerset with the GM 3.0L LN7 - 181 cu in - It has a NASTY knock - Would you Rebuild or Replace?
IF I do replace - Can I drop in a LG7 GM 3.0L V6 which was the replacement for the LN7 in 1989 Any sites or yards that would have either of the motors from that time
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04-05-2021, 12:23 PM | #2 |
Dumb Ass Deluxe
Drives: A Tricked Out Mountain Bike Join Date: Jun 2019
Location: Arizona
Posts: 1,959
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Just guessing, probably not.
The biggest thing to check is if the TA is the same. They might of beefed up the newer TA to match the TQ output of the new motor.
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04-10-2021, 09:49 AM | #3 |
Drives: '18 1SS 1LE Join Date: Sep 2017
Location: Pennsyltucky
Posts: 2,571
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Wow!
Rebuild might prove difficult if parts like a crankshaft or connecting rods are needed due to spun bearings. This engine was not as common as say the 3.8 where support would be more robust. Not sure if swapping in the newer engine would be possible without enough research. Things like crank reluctor tooth count, cam sensor design change, other things GM may have updated or modernized/changed might put some hurdles in the way. Finding a used engine might also be an issue as cars like this aren't that common in this part of the country anymore due to rust. Might have to look down south or out west where cars last longer. Good luck, I started out working on these cars when they were new, surprised the fluorescent display still works as good as it does.
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04-10-2021, 10:02 AM | #4 |
Drives: 2013 Camaro 2SS/RS Join Date: Aug 2020
Location: Pacific Northwest
Posts: 802
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I don't know about the engine but I see that they used the same steering wheel as they did in the GN. Also the dash appears to be the same. This is a front wheel drive configuration? Also, does the odometer tap out at 100K and then reset to zero as they do with the Regals? Which is why there are so many under 100K GNs for sale being offered. Most,I would suspect, are above 100K or even in the 200K range with no way to prove it other wise.
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10-11-2021, 12:16 PM | #5 |
ALWAYS-N-BOOST
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Sorry for the delayed reply - here she is with a few updates and a new Engine
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2012 1LS M6 Black-Sold 2013 2LT M6 BluRay- Sold 2015 1SS 1LE M6 Black-Sold 2021 ZLE A10 Riverside Blue - Awaiting Arrival 01/10 |
10-11-2021, 01:18 PM | #6 |
ALWAYS-N-BOOST
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Sorry for the delayed reply - here she is with a few updates and a new Engine
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2012 1LS M6 Black-Sold 2013 2LT M6 BluRay- Sold 2015 1SS 1LE M6 Black-Sold 2021 ZLE A10 Riverside Blue - Awaiting Arrival 01/10 |
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