The crankshaft bearing inserts are secured in the rod by indents on the cap and rod. If the bearing gets worn or the friction between the crankshaft and bearing gets high, the insert may come loose from these indents and spin inside the rod (not good).
Thomas E. Potter Telephone: (713) 215-2877 Fax: (713) 215-2551 Mobile: (832) 794-0536 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Behalf Of dave walton Sent: Tuesday, October 04, 2005 1:46 PM To: Mercedes mailing list Subject: Re: [MBZ] Whats this stuff on my 240D What does it mean to Spin a Bearing - or Spun a Bearing? Spin, Span, Spun - whatever... Thanks -Dave Walton On 10/4/05, Van Cleve <[EMAIL PROTECTED]> wrote: > > > > I pulled the head off and the pistons out yesterday and the sides if the > cylinder walls were totally smooth and polished, NO cross hatch marks at > all, #1 piston had spun a bearing and the crank is a little scratched, > which I think can be repaired. The rod is somewhat discolored about 2'' up > from the big end., which proly means replacement, hopefully I have one the > same weight in my spare parts bin. There is no ridge at the top of the cyl > walls but my plan is to have the block bored for o/s pistons. So far the > valve guides look good but will finish checking them out today. > > Steve > > ntent-Transfer-Encoding: 7bit > From: Peter Frederick <[EMAIL PROTECTED]> > Precedence: list > Subject: Re: [MBZ] Whats this stuff on my 240D > Date: Sun, 2 Oct 2005 10:21:16 -0500 > To: Mercedes mailing list <[EMAIL PROTECTED]> > In-Reply-To: <[EMAIL PROTECTED]> > Reply-To: Mercedes mailing list <[EMAIL PROTECTED]> > Message-ID: <[EMAIL PROTECTED]> > Content-Type: text/plain; charset=US-ASCII; format=flowed > MIME-Version: 1.0 (Apple Message framework v553) > Message: 4 > > The vacuum gizmo is the egr controller, you can discard it since you don't > have one. There will also be an EGR valve on the intake manifold. > > The pipe going into the oil pan is the drain from the oil separator in the > air filter housing, all W123 diesels have one. > > Likely the rebuilder put WAY too much clearance on the valve guides, unless > familiar with Benz practice. Easy way to check is to pull the cam and > remove a couple valve springs. If the valve will preceptibly move sidways > when lowered down off the seat, there is too much clearance. > > The other likely problem is way too much piston clearance, and that you can > only check by taking them out. Should be 0.001", very tight. You can > check for wear by pulling the head (as I'm sure you will be doing). > > Unless run out of oil until the engine seized, likely the crank and rods > are fine, they don't cause problems in that engine. Pistons may be shot, > too, if there was excessive clearance, it causes the rings to flex sideways > and extrudes the ring lands. > > Peter > > > > > _______________________________________ > For new parts see official list sponsor: http://www.buymbparts.com/ > For used parts email [EMAIL PROTECTED] > > To Unsubscribe or change delivery options go to: > http://striplin.net/mailman/listinfo/mercedes_striplin.net > _______________________________________ For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://striplin.net/mailman/listinfo/mercedes_striplin.net
