I did it at 180,000 miles. Just replaced the one rod. I now attribute the bent rod to hydrolock in that cylinder due to failure of the head gasket that allowed oil to enter the cylinder (oil-lock?). Given that the piston protrudes from the head when at the top of it's stroke and compress everything down to less than the thickness of the head gasket, just a bit of oil seeping in could really mess things up. At first I thought I had a turbo failure. If I had pulled the head right away rather than screwing around with the turbo, it probably would have been fine.
I played around with a dial indicator to try to measure roundness, but did not detect anything significant. That was probably due to a combination of user-error and cheap tools. All the cross hatches looked fine. The guy that told me about replacing #1 and #6 was a tech at a GM dealership. 50/50 chance he was full of it. -Dave Walton On Mon, Oct 12, 2009 at 7:21 PM, Kaleb C. Striplin <ka...@striplin.net> wrote: > Did you replace number one and number 6? Or just 1? Were your cylinders > ovalled at all? How many miles were on the engine? Maybe I caught mine in > time before it really trashed the bottom end. > > dave walton wrote: >> >> The replacement rod did not have tabs to allow easy weight adjustment. >> It is significantly heaver than the original. I've since been told >> that as long as #1 and #6 are balanced, it's okay if they are heaver >> than the others. I'd want to very that somehow, but replacing the two >> rods would save some grief. The dealer said if they did the job, they >> would replace all the rods. I was not in the mood to spend $1k to >> replace good parts at the time. But you could probably recoup some of >> your investment selling the good old ones on eBay :-) >> >> Once the rod was replaced, the piston extended above the block like >> all the others. >> >> Put some bar stock on the block across the cylinder opening. Use 2 >> magnetic bases. Mount the dial gauge between them on a crosspiece. Set >> the gauge to zero on top of the bar in the middle. Highest reading >> when the crank is rotated gives you a comparison number which relates >> to connecting rod length. >> >> -Dave Walton >> >> On Mon, Oct 12, 2009 at 10:41 AM, dave walton <walton.d...@gmail.com> >> wrote: >> >>> >>> I did not see any way to drop the oil pan with the engine in the car. >>> The front frame is directly under where you want to get to and can't >>> be removed (without a torch or plasma cutter). If anyone knows how to >>> avoid pulling the engine, please speak up. >>> >>> Once you get the oil pan off you can access the lower end of the >>> connecting rod to replace it without pulling the crank. >>> >>> The transmission and engine come out as a unit. >>> >>> You will need a 2-ton shop crane. To access the center of gravity of >>> the engine/transmission unit you need to extend the arm to it's >>> maximum. The lift capacity goes down as the arm length goes up. Even >>> with the Harbor Freight 2-ton crane maxed, the lift cylinder wanted to >>> hit against the front bumper. If I had to do it again, I'd use a >>> gantry crane on wheels. >>> >>> I was quoted $140 from the dealer for the replacement rod. They >>> charged me $190 when it came in. >>> >>> -Dave Walton >>> >>> On Mon, Oct 12, 2009 at 9:55 AM, Kaleb C. Striplin <ka...@striplin.net> >>> wrote: >>> >>>> >>>> If I wanted to replace that one rod, I would have to pull the crank and >>>> everything wouldnt I? >>>> Mitch Haley wrote: >>>> >>>>> >>>>> Loren Faeth wrote: >>>>> >>>>>> >>>>>> IMHO, you have a problem with a bent rod on #1. It is bent enough so >>>>>> that I predict a short life after the engine is running again , if you >>>>>> don't >>>>>> address the #1 rod at least. Seems to me what you describe is in the >>>>>> neighborhood of 0.010 inch or so, (maybe more) and that is a problem. >>>>>> >>>>>> >>>>> >>>>> I concur. If five pistons stand proud of the block, and one piston is >>>>> recessed, and you can detect that by feel, there's something wrong with >>>>> that >>>>> one cylinder. >>>>> When you add to that the fact that the most worn cylinder is the same >>>>> one >>>>> with the short rod, and it's the cylinder that's famous for bending its >>>>> rod, >>>>> I'd say replace that rod and hope you caught it quick enough so that >>>>> cylinder still seals ok. If one cylinder out of six makes 95% of the >>>>> power >>>>> of the others, the engine as a whole shouldn't run too badly. >>>>> >>>>> Mitch. >>>>> >>>>> _______________________________________ >>>>> http://www.okiebenz.com >>>>> For new and used parts go to www.okiebenz.com >>>>> To search list archives http://www.okiebenz.com/archive/ >>>>> >>>>> To Unsubscribe or change delivery options go to: >>>>> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>>>> >>>>> >>>> >>>> -- >>>> Kaleb C. Striplin/Claremore, OK >>>> 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 89 >>>> 560SEL, >>>> 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro manny, >>>> 81 >>>> 240D, 80 240D, 76 240D, 76 300D, http://www.okiebenz.com >>>> -------------- next part -------------- >>>> >>>> Internal Virus Database is out of date. >>>> Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: >>>> 270.13.113/2400 - Release Date: 09/28/09 05:51:00 >>>> _______________________________________ >>>> http://www.okiebenz.com >>>> For new and used parts go to www.okiebenz.com >>>> To search list archives http://www.okiebenz.com/archive/ >>>> >>>> To Unsubscribe or change delivery options go to: >>>> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >>>> >>>> >> >> _______________________________________ >> http://www.okiebenz.com >> For new and used parts go to www.okiebenz.com >> To search list archives http://www.okiebenz.com/archive/ >> >> To Unsubscribe or change delivery options go to: >> http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com >> ------------------------------------------------------------------------ >> >> >> Internal Virus Database is out of date. >> Checked by AVG - www.avg.com Version: 8.5.409 / Virus Database: >> 270.13.113/2400 - Release Date: 09/28/09 05:51:00 >> >> > > -- > Kaleb C. Striplin/Claremore, OK > 95 E300, 92 500SEL, 92 300SD, 92 300E 4Matic, 91 300D, 91 300E, 89 560SEL, > 87 300SDL x2, 85 380SE 5.0 Euro, 85 190D, 84 190D, 84 300D euro manny, 81 > 240D, 80 240D, 76 240D, 76 300D, http://www.okiebenz.com > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: > <http://okiebenz.com/pipermail/mercedes_okiebenz.com/attachments/20091012/b27f9d24/attachment.html> > _______________________________________ > http://www.okiebenz.com > For new and used parts go to www.okiebenz.com > To search list archives http://www.okiebenz.com/archive/ > > To Unsubscribe or change delivery options go to: > http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com > _______________________________________ http://www.okiebenz.com For new and used parts go to www.okiebenz.com To search list archives http://www.okiebenz.com/archive/ To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
