[MBZ] 190DT Head Gasket
Hi, All. I'm planning on doing the head gasket (to music wearing funny blue clothes) on my '87 190DT this weekend and I've a few question to ask about what i may find:- 1. Turbo oil supply, is it just remove and replace? 'o' rings? No suitable o-rings in gasket set or midget gaskets either. 2. Assuming that the head has not been grossly overheated, may the head be just cleaned, checked for cracks and flatness and re-installed? 3. Anyone with pearls of wisdom please respond. (I know I'm asking for it.) TIA Fred Moir Lynn MA 84 190D Ugly engine 85 300TD Nice 87 190DT Oil in the Water 85 190E Organ Donor
Re: [MBZ] 190DT Head Gasket
On Thu, Jan 19, 2006 at 07:59:58PM -0500, frederick w moir wrote: Hi, All. I'm planning on doing the head gasket (to music wearing funny blue clothes) on my '87 190DT this weekend and I've a few question to ask about what i may find:- 1. Turbo oil supply, is it just remove and replace? 'o' rings? No suitable o-rings in gasket set or midget gaskets either. 2. Assuming that the head has not been grossly overheated, may the head be just cleaned, checked for cracks and flatness and re-installed? 3. Anyone with pearls of wisdom please respond. (I know I'm asking for it.) Assuming a 602 is like a 603, whatever seal was on the turbo oil supply I was able to reuse. The head on a 602 is more durable, so the likelihood of fatal cracks is pretty low. There might be some cracks, but the head will probably still pass a pressure test. Examine the head gasket upon removal, and see if it was a gasket failure that caused the problem. Also assuming a 602 is like a 603, you'll need a pin puller to pull the pins that hold the timing chain rail to the head. I made one with a M6-1.0 bolt about two inches long, a handful of flat washers (four to six, I think), a 3/4 long nipple (from the plumbing section), and a nut that threaded onto the bolt. This was obviously cheaper than buying the correct tool. Speaking of tools, you're going to need an XZN (triple square) driver to get the head bolts off. If you reuse the head bolts, you'll need a dial gauge/ verneer calipers to measure the maximum allowable stretch. Again assuming the 602 is like a 603, the head will come off with the header and turbo attached. While the head is aluminum, it isn't exactly light with the exhaust manifold and turbo attached. Above all, do NOT do this without the procedure for removing the cam. The cam is hollow, and will snap if you remove the bolts holding the cam down in the wrong order. If Brian Toscano is still lurking around, he did this about a year and a half ago on a friend's 190Dt. Good luck. K
Re: [MBZ] 190DT Head Gasket
I'd take it to a machine shop and get the head checked, valve guides checked and replaced if worn, new valve seals, etc. while you have it off. On 1/19/06, Kevin [EMAIL PROTECTED] wrote: On Thu, Jan 19, 2006 at 07:59:58PM -0500, frederick w moir wrote: Hi, All. I'm planning on doing the head gasket (to music wearing funny blue clothes) on my '87 190DT this weekend and I've a few question to ask about what i may find:- 1. Turbo oil supply, is it just remove and replace? 'o' rings? No suitable o-rings in gasket set or midget gaskets either. 2. Assuming that the head has not been grossly overheated, may the head be just cleaned, checked for cracks and flatness and re-installed? 3. Anyone with pearls of wisdom please respond. (I know I'm asking for it.) Assuming a 602 is like a 603, whatever seal was on the turbo oil supply I was able to reuse. The head on a 602 is more durable, so the likelihood of fatal cracks is pretty low. There might be some cracks, but the head will probably still pass a pressure test. Examine the head gasket upon removal, and see if it was a gasket failure that caused the problem. Also assuming a 602 is like a 603, you'll need a pin puller to pull the pins that hold the timing chain rail to the head. I made one with a M6-1.0 bolt about two inches long, a handful of flat washers (four to six, I think), a 3/4 long nipple (from the plumbing section), and a nut that threaded onto the bolt. This was obviously cheaper than buying the correct tool. Speaking of tools, you're going to need an XZN (triple square) driver to get the head bolts off. If you reuse the head bolts, you'll need a dial gauge/ verneer calipers to measure the maximum allowable stretch. Again assuming the 602 is like a 603, the head will come off with the header and turbo attached. While the head is aluminum, it isn't exactly light with the exhaust manifold and turbo attached. Above all, do NOT do this without the procedure for removing the cam. The cam is hollow, and will snap if you remove the bolts holding the cam down in the wrong order. If Brian Toscano is still lurking around, he did this about a year and a half ago on a friend's 190Dt. Good luck. K ___ http://www.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 -- OK Don, KD5NRO Norman, OK '90 300D 243K, Rattled '87 300SDL 290K, Limo Lite, or blue car '81 240D 173K, Gramps, or yellow car '78 450SLC 67K, brown car '97 Ply Grand Voyager 78K Van Go
Re: [MBZ] 190DT Head Gasket
Hi Fred, In addition to the excellent post by Kevin, I'd definitely change the valve guide seals while you have easy access. Ask Rusty for the Genuine Mercedes seal kit. Wouldn't hurt to have a machine shop check it for flatness, etc... cracks should be visible to the naked eye if there are any (probably won't be on a 602). This is also a good time to change any noisy lifters... when you squeeze the button on the underside of the lifters, it should be quite firm, even solid. If it squishes in easily, it's probably a bad lifter. I had 5 of 12 old ones fail this very rudimentary test. All the new ones were rock solid, and quiet. About $25 each from Rusty. Check chain stretch while it's apart, replace chain if stretched 4 degrees or more. Replace the upper chain guide rail (it's really cheap), and you may need two new rail pins, if the old ones don't look healthy upon removal, or were damaged when removing. The OE/dealer XZN head bolt tool is quite reasonable, btw - under $20 last time I checked. If you want/need to pull the prechambers for any reason, I'm selling the tools for that and will be happy to make you a deal! :-) +dm -- Date: Thu, 19 Jan 2006 19:59:58 -0500 From: frederick w moir [EMAIL PROTECTED] Subject: [MBZ] 190DT Head Gasket Hi, All. I'm planning on doing the head gasket (to music wearing funny blue clothes) on my '87 190DT this weekend and I've a few question to ask about what i may find:- 1. Turbo oil supply, is it just remove and replace? 'o' rings? No suitable o-rings in gasket set or midget gaskets either. 2. Assuming that the head has not been grossly overheated, may the head be just cleaned, checked for cracks and flatness and re-installed? 3. Anyone with pearls of wisdom please respond. (I know I'm asking for it.) TIA Fred Moir Lynn MA 84 190D Ugly engine 85 300TD Nice 87 190DT Oil in the Water 85 190E Organ Donor
Re: [MBZ] 190DT Head Gasket
On Jan 19, 2006, at 7:59 PM, frederick w moir wrote: Hi, All. I'm planning on doing the head gasket (to music wearing funny blue clothes) on my '87 190DT this weekend and I've a few question to ask about what i may find:- 1. Turbo oil supply, is it just remove and replace? 'o' rings? No suitable o-rings in gasket set or midget gaskets either. 2. Assuming that the head has not been grossly overheated, may the head be just cleaned, checked for cracks and flatness and re-installed? 3. Anyone with pearls of wisdom please respond. (I know I'm asking for it.) TIA Fred Moir First off, I highly recommend listening to Motown. Turbo has a seal kit for oil supply and return, the seals on the air side are separate from this kit. I don't have part# handy. You can re-use the head if it checks out. I would at least change valve seals, if it got hot they could well be hardened. There is a tool for holding down the valves/compensators as the camshaft is removed. I wouldn't rule out dropping the head off at a competent machine shop and having them go through it. Look for broken head bolts too, often the cause of head gasket failures. I buy new bolts to coax the odds a bit. There is a TSB on the hydraulic compensators, might want to look into that at this time too. It may or may not pertain to your engine. Johnny B iMac therefore I am
