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#4467809 - 07/23/17 09:05 AM PH3980 cut open
dlundblad Online   happy


Registered: 09/30/13
Posts: 10037
Loc: Indiana
Roughly 3k with Delo 15w30 on my '97 Blazer with the 4.3. I replaced my LIM gaskets last week, drove the truck a bit and changed the oil first thing.

As you can see in the last photo, some crud made it into the engine despite of me placing a bed of towels down into the engine and using a shop vac during gasket removal and surface prep. I'm going to do some pretty severe OCI's until that crude goes away. I'm using an AC Delco PF52 and some Certified 10w30 and will probably change it sometime this week because I'm anal retentive like that.










Edited by dlundblad (07/23/17 09:07 AM)
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4467813 - 07/23/17 09:09 AM Re: PH3980 cut open [Re: dlundblad]
dlundblad Online   happy


Registered: 09/30/13
Posts: 10037
Loc: Indiana
Here's an upside down photo (sorry folks, uploaded from phone.) of under the valve cover. I bought the kit that came with all the replacement gaskets as well. No sludge thankfully, but lots of heavy varnish. The truck was neglected by the PO. 2 year old oil, did a lot of sitting, bad LIM gaskets and a bad/ wrong thermostat.




Edited by dlundblad (07/23/17 09:11 AM)
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4467823 - 07/23/17 09:24 AM Re: PH3980 cut open [Re: dlundblad]
Kuato Offline


Registered: 10/23/05
Posts: 7094
Loc: Colorado
Oil-wise, the valvetrain looks great so suspect the rest of the engine does also.
_________________________
Thick vs Thin test: 15k / 43k miles complete

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#4467885 - 07/23/17 10:38 AM Re: PH3980 cut open [Re: dlundblad]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: dlundblad
I'm going to do some pretty severe OCI's until that crude goes away.


No need.

I'm willing to bet you've already caught 99+% of it already
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4467886 - 07/23/17 10:40 AM Re: PH3980 cut open [Re: dlundblad]
Linctex Offline


Registered: 12/31/16
Posts: 6148
Loc: Waco, TX
Originally Posted By: dlundblad
The truck was neglected by the PO.

2 year old oil, did a lot of sitting,


2 year old oil didn't cause any harm.

The corrosion in that coolant passage is disconcerting.
_________________________
"The evidence demands a verdict".
(Re:VOA)"it's nearly impossible to actually know the particular additives that are in there at what concentrations."

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#4468041 - 07/23/17 01:56 PM Re: PH3980 cut open [Re: Linctex]
dlundblad Online   happy


Registered: 09/30/13
Posts: 10037
Loc: Indiana
Originally Posted By: Linctex
Originally Posted By: dlundblad
The truck was neglected by the PO.

2 year old oil, did a lot of sitting,


2 year old oil didn't cause any harm.

The corrosion in that coolant passage is disconcerting.


I agree. There was a mass of crud in these areas on both sides of the engine. The intake had a bit of pitting too.
_________________________
03 Jeep WJ 4.0 199k Castrol Edge 10w40 HM Fram XG16
02 Volvo S60 2.4T 177k M1 0w40 Mahle OX149D
97 Chevy Blazer 4.3 145k Rotella T5 10w30 Fram TG3980


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#4468091 - 07/23/17 03:02 PM Re: PH3980 cut open [Re: dlundblad]
AirgunSavant Offline


Registered: 07/22/15
Posts: 3772
Loc: MD
My father left me his Blazer a 2000 model. Garage queen.
Well maintained but a gas hog.... I guess they are all that way. I take good care of it because he
loved it. First new car he ever bought for himself.

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#4468685 - 07/24/17 07:59 AM Re: PH3980 cut open [Re: dlundblad]
BigD1 Offline


Registered: 08/12/15
Posts: 2575
Loc: NC
Filter looks to held up good. Must be an older 3980 because the seam is glued now.

That engine actually looks very good, and the varnish is no problem.

I would definitely do some type of coolant flush cleaning. The Mercedes citrus flush is an option.

http://dieselgiant.com/mercedes_citrus_flush.htm



_________________________
1992 Toyota Pickup--Havoline HM 10W-30--Motorcraft FL-910S

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#4468762 - 07/24/17 09:38 AM Re: PH3980 cut open [Re: BigD1]
Triple_Se7en Offline


Registered: 12/04/04
Posts: 8771
Loc: 1/2 hr. north of Detroit
All that varnish reminded me of the 80s and early 90s when I used Castrol oil and varnish was included in every bottle back then.

I've never purchased Castrol since..... not even their synthetics. When I see an issue with any products (oil or even handgun bullets for example), I avoid repurchases like the plague.... for decades.

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