Date: 14 Oct 2004 14:01:27 GMT From: Dave Hinz <DaveHinznospamcop.net> Subject: Re: H engine in 9-5?
On Thu, 14 Oct 2004 01:45:01 +0100, Charles Christacopoulos <c.k.christacopoulos_removeme_nospamee.ac.uk> wrote: > Dave Hinz wrote: >> For reasons I really don't want to go into right now, I'm asking an >> uncomfortable question. > > I think you have lost your head so here is some help to see if you can > get it back on its stand (neck). Could be. Seems a logical next step is a compression test, after which pulling the head is physically and logically next. >> He is also bowing out of the repair process, as he's not comfortable in >> getting too deep into something he doesn't know. > > He is honest. He probably knows the problem but wants an easy(ish) life > and no customers coming back to complain. Well, he's also a personal friend (we've been firefighters and EMTs together for a decade or so) so I take him at his word. >> OK, here's my real question I guess. WTF would happen while driving that >> would include PCV hoses (plural) bursting/dissolving, and when said hoses >> are fixed would include knocking of the engine? I don't get it. I'm >> rather pissed off right now so if I'm not being real clear please forgive. > > Missing the meaning of WTF. What The Fuck. As in, "this doesn't make sense, what is going on here" with a "I'm a bit upset" connotation. > Crankcase pressure can happen in one way (and with imagination in two > more ways). > Method 1. Gases escape from the piston rings/cylinders into the > cranckcase etc. Worn/broken rings or worn cylinders. He's thinking rings. At 93K miles???? Again, WTF? > Method 2. Gases escape via the valve guides. Ah. > Method 3. Completely screwed up ignition timing (not really). Postulate 4: Massive air leak in PCV system causing engine management system to not know when to fire so it _sounds_ like pinging maybe? > The first is the most likely. If you have blue smoke and possibly > reduced performance you are looking for a broken ring(s). The chances > are the problem is at (1). A compression test should reveal what is > happening. He's doing one for me this morning, will know results soon. > If you follow the normal steps you should see if some > cylinders are faulty or if they are all worn it should show up when you > test with some oil dropped in the cylinder. >> Suggestions? Can I stick a "B" engine in there? How about an "H" engine? > No comment. It's just that I have this nice nearly shiny B-engine I'm rebuilding right now for the '78 99 Turbo. >> Could this actually be something trivial in the PCV system that just >> makes the engine sound like crap and _sound_ like a knock? > > If it is a real knock (following from point 1 above) then it is a > completely worn out engine (big ends or small ends or both are gone). Which would be odd. > If however the ignition timing is gone wrong (faulty chain, gears or > electronics) then ... sorry my timing knowledge is using stroboscopes > nothing with the electronic stuff. Same here, that's why Bill is working on it at the moment. If it turns into a mechanical issue again (rings/valves/etc) I'm good to go, but I'm just not comfortable on the newer ones like I am on the older ones. Maybe that's about to change. > I have knows bad timing (valve timing) in my previous C900 to cause fuel > and a lot of oil to go back in the air filter only to be sucked back in > and cause a lot of dirt everywhere. Something like that could happen > with a stuck valve or a faulty hydraulic tapet (thingie on the valve). > Not enough though to explain all the things you describe. Right, and I'd probably have heard tappet noises which were decidedly not there at all. > I would start from a compression test. Sorry I am not saying what it > involves as I am not sure of the proceedure to isolate electronic > ignition systems ... and catalytic converters. I am hoping that it's as simple as gauge in spark plug hole and crank it? It's a DI car so it won't start running at that point, all things considered... > If you have a worn engine it may be worth rebuilding, if something is > broken a lot will depend on damage in the cylinders. Yup. > If it helps at all. It does, I appreciate your time and thoughts as always. I think we've been crossing paths on Usenet for over a decade, haven't we? Misc.rural back in the 90's, and here at least? Dave Hinz
 |
 |
 |
 |
 |
