Another PCV Rear Main Question - TerrainForum.net: GMC Terrain Forum
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post #1 of 6 (permalink) Old 04-03-2019, 08:10 PM Thread Starter
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Question Another PCV Rear Main Question

So I replace timing sets on these Ecotec engines often and have a "swap" system going where I always have a valve cover that has been hot tanked and dried ready to install with new chain sets. I inspect the front covers/ oil pumps as well as the intakes for excessive sludge and or blockages and swap out if needed. I understand timing sets can be daunting replacements to the average Theta owner, but the valve cover can be removed with minimal tools and skill set. I would say if you can change your oil, you can remove your valve cover and get to a machine shop for a hot tank service. Would be way more effective than the wire through port method. Just my opinion. I have seen the effects of ignoring it.


Has GM weighed in on a vented oil cap? I know they had a campaign to make sure the intake breather orifice was flowing as intended, but hadn't heard if they endorse the breather remedy as long term replacement.



What is the recommended maintenance plan for this issue? I am interested in both what the proper way is to prevent it from getting clogged and also curious what steps GM takes (cash pay or warranty) to correct a clogged system. Prior to rear main damage I mean.


After rear main damage (blow out) is the seal simply replaced or does the engine sustain damage and need a tear down?

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Rebuild Ecotec engines
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post #2 of 6 (permalink) Old 04-03-2019, 08:30 PM
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Interesting post, will be interesting to follow and see the thoughts on it.
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post #3 of 6 (permalink) Old 04-03-2019, 11:20 PM Thread Starter
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By the time people answer my ad om Craigslist its too late. They need Ecotec resurrection not maintenance or simple repair. I used to point finger and question how they can ignore oil changes or routine check ups. But now I understand they do actually visit a national chain for oil and filter and trust that is sufficient. The techs there simply drain fill and stamp the return mileage. Owners have no idea they were down 3 quarts. Nor do they understand that the remaining quart is under such strain and is barely oil.


I just purchased a 2013 Terrain and am hoping to avoid failure of any kind by preventative watchdog habits. When I remove these Ecotec engines that have rod knock or timing system failure I usually see an engine full of carbon and sludge with shiny metal flakes to top it all off. I would like to know what starts it all.

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post #4 of 6 (permalink) Old 04-04-2019, 02:01 PM
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Maybe this will add a little perspective on those customers not knowing they were down 3 quarts. The local news program commented the other day that a survey showed that 59% of Americans don't even know how to check the oil on their cars now. Needless to say, being an old farm boy, I was pretty shocked by that statistic. But I guess I shouldn't be, after all most car owners today don't delve any further into their owners manual past all the features their infotainment center has. A lot of the fault can be laid on how driver's training is structured today. When i was in HS we had a full semester of driver's training, the first half of that semester entailed how an internal combustion engine worked, maintenance, and even how to change a tire which even the girls were required to do before getting seat time behind the wheel. Manual transmissions are pretty much a relic of the past, but back then and for several years after our driver's training cars had manual transmissions so those that already didn't know learned how to drive a stick. My driver's training car was a 65 BelAir 4 dr. sedan, 195 hp 283, with the 3 on the tree and a BW R10 manual overdrive. By the time driver's training was over with even the city girls had mastered the art of over/under on that transmission. I had a head start learning to drive the same transmission setup, learned on the farm when I was 12 yrs. old, and yes that was 58 yrs. ago.
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post #5 of 6 (permalink) Old 04-04-2019, 03:16 PM
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garagerog--my sentiments exactly! And we are only a year apart in age--won't say who is older, but my driver's ed car was a '63 Ford Fairlane, v8 with 3 speed overdrive. Spent days driving in circles in an empty unpaved city block learning to feel the friction point (well, those who had never driven a clutch on the farm). I still use the same process when teaching some to drive a clutch. By-the-way, I wonder how many recognize BW as Borg Warner?

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post #6 of 6 (permalink) Old 04-04-2019, 04:44 PM
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Probably not many c&w on the BW, to me that overdrive unit was way ahead of it's time. If I'm not mistaken it was used as far back in some autos as far as the 30's, a sun gear setup that replaced the tail-shaft housing on 3 speed manual transmissions. It was even modified by some in the 70's to work on Saginaw 4-speeds that had the reverse gear in the main transmission housing, instead of having the reverse gear in the tail-shaft housing like the Muncies did. The R10's time was expiring in the 60's though, it just wasn't stout enough for the higher hp cars. GM limited it to the 195 hp 2bbl 283, anything higher hp than that and it wasn't available. BW did make a stouter unit, the R12 for Ford, saw a YouTube video years ago with a 64 Galaxie 406 ci running the 3 speed manual with the R12 BW overdrive, if that video is still around it makes for an interesting view.
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