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Post Info TOPIC: Hemi engine failure
67ss


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Hemi engine failure
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My wife’s Durango decided to lose oil pressure about three weeks ago. Luckily she shut it down right away and I towed it home. In the weeks prior it had started making a rattling noise at about 2500 rpm and at one point it developed a miss on #1 cylinder for a short time and then went away. Out came the engine, in tear down I found the oil pump relief valve had stuck causing the loss of oil pressure. I pulled a couple rod bearings and a main bearing cap to check damage and the bearings looked perfect and the cylinder walls still show a nice crosshatch. So I decided the plan was to rering the engine as it also had started using some oil between changes. Well as I tore into it farther I found my #1 misfire issue with a wiped out lobe on the camshaft. I was also planning to get rid of the cylinder shut down system anyways as I hate it and it is what usually causing the rings to stick when the motors get mileage on them. There are lots of companies selling delete kits so I ordered it up and then sent the heads to the machine shop just for good measure. Here are some pictures of all the fun.



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Chris P
East Central, Mn

66 Chevelle 300 deluxe
Chris R


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How many miles are on the vehicle? Mopar still continues to have problems with the cams in the Hemi going flat & its been going on since the 5.7 came out in the 90s. Its amazes me that Chrysler hasn't fixed this problem. They really aren't that bad of engines. Im still hearing dealers are on backorder for replacement cam kits for vehicles under warranty.



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Chris - Ramsey, MN.

Dear Optimist, Pessimist, and Realist.

While you guys were busy arguing about the glass of water. I drank it!

Sincerly,

The opportunist.
Dave Seitz


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Friend of mine was over today and asked about replacing cam bearings in his Hemi pick up. I said no go to a shop I am to busy with the everything I have going now the way it is.

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67ss


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Motor has 137000. Owned it since 39000 and have always used mobile 1 oil in it.



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Chris P
East Central, Mn

66 Chevelle 300 deluxe
Derek69SS


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Not just a Dodge thing, GM's LS platform isn't immune either. The "Displacement on Demand" system is a ticking timebomb in the LS's, and will send a lot of metal through the engine when they go... planning to delete it in the G8 soon, and do a cam swap while we're at it. ;)

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Derek Kiefer - Mantorville, MN

69 Malibu Pro-Touring stroker LS1-383/T56 - 69 SS396-325/3spd project
67ss


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You are correct the LS is just as prone for issues. It surprised me how similar the hemi and ls platforms are to each other.



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Chris P
East Central, Mn

66 Chevelle 300 deluxe
Chris R


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I feel like I remember back in my days as an auto tech that ever since that 5.7 hemi came out in the new style pickups not long after the square body Dodges ended, dealers were getting warranty valve train problems even back then when Daimler owned them. This whole DOD generation has made the issue worse. Especially for the LS. Problems didn't seem to be quite like this before DOD.



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Chris - Ramsey, MN.

Dear Optimist, Pessimist, and Realist.

While you guys were busy arguing about the glass of water. I drank it!

Sincerly,

The opportunist.
Back in Black


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I can disable the MDS system on my '14 Ram by pressing the - of the -+ gear button on the steering wheel.

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Keith - Rochester, MN

1970 El Camino SS 396 L78

'09 Viper SRT-10X Coupe
'09 Car Craft RSE Winner
10.76@133.73
190.0 mph Standing Mile
67ss


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Engine is back in and has been running for a few weeks now. So far so good just need to get it to the tuners to shut off the codes for the MDS solenoids and it should be all done. My plan going forward is to put a small amount of zddp additive in with the oil changes. Yes it may shorten the life of the cats but I don't care.



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Chris P
East Central, Mn

66 Chevelle 300 deluxe
Lost in the 60s


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If the engine isn't burning the ZDDP, it really shouldn't hurt the cats either. Even if it does, a sawzall and mig to change them is a whole lot easier than pulling and rebuilding an engine.

August tech session at your place to get the Malibu on the road ?  stirpot



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Mitch D.   River Falls, WI

Lifetime member of the "Cars apart Club"

Some Assembly Required

1966 Chevelle SS 396 M20

1970 Chevelle SS 396 M20

1967 Camaro SS 350 rs
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