Buick - Engine Noise and Repair Techniques (1993)

[@bjzq8]

When I was in community college, we got several of these exchange engines to play with and take apart. We had a barn full of them. Some of them had been pre-production engines, some had been customer engines. Most of them had tiny little problems, but they were enough to get them changed out. We had a Northstar V-8 that had its starter motor replaced enough times (condensation issue supposedly) that it got replaced entirely. We had it on a stand.

[@int53185]

Wow! I guess I'll never use another scotch brite to clean a mating surface again!. Awesome video!

[@theundergroundlairofthesqu9261]

Yep! I had to look it up. It's not just the sandpapery discs, the Scotchbrite has aluminum oxide in its fibers, too.

[@fitimio001]

This is really good though...

[@ahmedhussien6462]

Nice video

[@paradisemace1]

It sounds to me like Buick just admitted to a design flaw in their oil pressure relief valve :-)

[@thysonsacclaim]

Lots of vehicles have these, and where used they are necessary.

[@darrylsmith5079]

The relief valve is built into the oil filter, it's not a "Buick design flaw".

[@paradisemace1]

@@darrylsmith5079 EL NOPEY

[@CT_Taylor]

@@paradisemace1 what flaw you mean? there is a bypass in the mount and then filters have anti drain back

[@gregorymalchuk272]

​@@darrylsmith5079 The oil pressure relief valve is a spring loaded piston that blows off excess oil pressure to maintain the regulated oil pressure. As the engine wears or the oil heats up, the blowoff gets less and less until it can no longer maintain full rated pressure. The valves can stick closed and lead to crazy high oil pressures and drag on the engine, or stick open and lead to no oil pressure. Some newer engines use variable displacement vane pumps to regulate the oil pressure, like the ones GM has used in automatic transmission oil pumps for some time.

[@jessicaleon9012]

i wonder why they never found why there intake gasket always fuck up throws coolant in the oil

[@lungandfoot]

I think it was because they were originally plastic and prone to breakage? Eventually got replaced by aluminum gaskets I think.

[@dalesterling2172]

I do believe the cause of why the intake gaskets always 'messed' up was discovered, Jessica. You see, during the late 80's and early 90's suppliers were pushing plastic as the carrier material for gaskets probably because it was an easier way of retaining the silicone bead that actually did the sealing. (Many engines went this way as did different auto companies.) I also don't think engineering validation tests lasted that long either because if you remember, I think warranties back in the 80's only went to 12,000 miles. Warranties later, starting in the 90's, shot up to 60,000 and then to 100,000 miles forcing the engineers to have to validate their products for longer periods of time. I mention all this because these plastic intake gaskets failed due to material 'creep'. The hot coolant running through the cooling ports softened the plastic and slowly pushed the material outward carrying the silicone bead with it until the bead slipped all the way out from beneath the intake and head sealing surfaces allowing coolant to run into the valley and then into the crankcase. The orange coolant was blamed for the gasket failures but I really believe it was more the fault of the plastic carrier material not being able to stand up to long-term thermal cycling. I saw failures from 50,000 mi all the way up to 240,000 miles. It just depended mostly on the kind of driving you did. And like Brian says below, the fix for this on the 3300/3800 was a change to an aluminum carrier material for the intake gaskets. Longer term and harsher validation testing is also done on more current engines as well as design changes on 'V' engines that don't even channel coolant through the intake and into the head any more. It's all part of automotive engineering evolution.

[@ras4782]

My 2001 Buick lesabra doing some squeaky noise can anyone help me out

[@davisjames8484]

No

[@oliverrojas7117]

Hi, When does the squeaky noise occur?

[@mamz1404]

اللهم صل وسلم وبارك على عبدك ورسولك محمدﷺ

[@fitimio001]

I hear someone breathing .... weird

[@0326Hambone]

Same here, kinda throws off my concentration lol.

[@dalesterling2172]

Sorry, Fitimio, but I've listened to this video dozens of times on VHS, DVD and on different computers and have not heard breathing. Perhaps it's the quality of your speakers or you are hearing the engines running during those portions where an engine had to actually be turned on. This video was done professionally in a studio as well as audited afterwards so I doubt it was "breathing" you actually heard. Although I did not put this video on-line I'm glad to see it is still here because those conditions described still occur today.

[@ronniebuicks5569]

BUICK!!!!

[@kenj.8897]

Dealerships need better mechanics