Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   PeachParts Mercedes-Benz Forum > General Discussions > Off-Topic Discussion

Reply
 
LinkBack Thread Tools Display Modes
  #61  
Old 08-25-2022, 02:13 PM
tbomachines's Avatar
ಠ_ಠ
 
Join Date: Mar 2009
Location: Philadelphia
Posts: 7,366
Quote:
Originally Posted by cmac2012 View Post
Great! Glad you like it.

OK, raise your hand if you thought the hesitation problem was a CAT that was disintegrating internally. I needed to get it smogged now anyway and I just barely passed HC two years ago so I figured a new CAT was in the works. After he told me I consulted the Google and sure enough, there are opinions that say such a CAT will lead to hesitation and surging, which is exactly what I had.

He said the new cat was an improvement but still not perfect. He had to put in a T connection with nipple on the fuel line in order to test the pressure. He said it was only at about 6 or 7 and it needs to be 13. New fuel pump. Runs ideally now.

While the tank was out he looked it over for crud, said it looked pretty good. Took out a few bits of something.
is your o2 sensor precat or post? I could see the O2 fouled or a post cat signal being bad and giving poor readout to the primitive ECU. Unless it was actually clogged, I dont quite understand how that fits together, especially if its precat at idle.

__________________
TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth
Reply With Quote
  #62  
Old 08-25-2022, 03:43 PM
cmac2012's Avatar
Renaissances Dude
 
Join Date: Dec 2004
Location: Redwood City, CA
Posts: 33,916
Quote:
Originally Posted by Dubyagee View Post
Good deal. A 5.7 is not more efficient as the architecture is the same. More displacement takes more fuel to do the same motions as the 5. I would get the valve guide seals changed as they the smoke is robbing power and hurting your new cat.
Valve guide seals is not something I’ve ever done. Given my less than optimal shop space at this time, Not sure I can pull it off. Rather than ask you to walk me by the hand, I found this video of the job being done on a similar engine:

https://youtu.be/CBK6ACbvF9c

WAG my man Ky might need $1k for that job. But you make a good point. I previously welded in my own CATs with ugly welds. Can’t do that at this time, that job’s about a $700 bill these days. Would be nice to avoid premature death.
__________________
1986 300SDL, 362K
1984 300D, 138K

Last edited by cmac2012; 08-25-2022 at 04:22 PM.
Reply With Quote
  #63  
Old 08-25-2022, 04:03 PM
cmac2012's Avatar
Renaissances Dude
 
Join Date: Dec 2004
Location: Redwood City, CA
Posts: 33,916
Quote:
Originally Posted by Dubyagee View Post
Good deal. A 5.7 is not more efficient as the architecture is the same. More displacement takes more fuel to do the same motions as the 5. I would get the valve guide seals changed as they the smoke is robbing power and hurting your new cat.
This thing weighs about 6000 pounds and the 5.0 does push it around pretty well. No need to be greedy. If if I had Jay Leno’s garage and money I might put in one of those Chevy diesel’s I’ve heard about it, not the 6.2, I forget what it’s called, but I’ve heard incredible stories about them.
__________________
1986 300SDL, 362K
1984 300D, 138K
Reply With Quote
  #64  
Old 08-25-2022, 04:16 PM
cmac2012's Avatar
Renaissances Dude
 
Join Date: Dec 2004
Location: Redwood City, CA
Posts: 33,916
Quote:
Originally Posted by tbomachines View Post
is your o2 sensor precat or post? I could see the O2 fouled or a post cat signal being bad and giving poor readout to the primitive ECU. Unless it was actually clogged, I dont quite understand how that fits together, especially if its precat at idle.
It’s pre-CAT. Sorry to be at dense, but I’m not sure the point you’re getting at. I have no idea if the O2 sensor was really needed, but like you said earlier they’re not expensive, under 30 bucks, and they do wear out, and this is an oldvehicle. I’ve not replaced one in this vehicle before, I’m certain of that.

I don’t regret the random parts replacing I did, just for my own entertainment and maybe others here’s a list of the parts:

Plugs, cap n rotor, cables, air filter. Ran a lot better for a week.

Coil, fuel filter, O2 sensor, EGR plus solenoid.

About two months ago I put in front rotors, calipers, bearings, and pads. Also a starter, it was clearly going. The front brake had been seizing now and then making a hell of a racket, then one of them went metal on metal, turns out the other side was close to that. I want to do the rear brakes and new drums, maybe new slave cylinders as well. I think the rears do a little bit of seizing and shuttering on occasion, just when cold but it’s a PITA. Not sure if a new master cylinder is advised, but if I had four new wheel cylinders, a new master plus major system flush would be pretty wild. A new TBI would be another upgrade I would think.

After that if I put in new rear bearings, this thing will be a happening rig.

OTOH, there is merit to the “if it ain’t broke, don’t fix it” point of view.
__________________
1986 300SDL, 362K
1984 300D, 138K

Last edited by cmac2012; 08-25-2022 at 05:04 PM.
Reply With Quote
  #65  
Old 08-25-2022, 07:17 PM
vwnate1's Avatar
Diesel Dandy
 
Join Date: Nov 2005
Location: Sunny So. Cal. !
Posts: 7,717
Talking If It's Not Broken, FIX IT UNTIL IT IS !!!!

That video is pretty good, you don't need an air compressor, just 3' of cheap cloth rope, twirl it in the open spark plug hole then rotate the engine by hand until the piston comes up and jambs against the valves.....

Before you do that I highly suggest you personally checking the spark plug gaps as they're always too narrow out of the box and your HEI should easily work .045" gaps......

More spark = better combustion .

My old 1976 GMC pickup burned so much oil it fouled the spark plugs in 200 miles, after sharply tuning it and opening the plug gaps it _flew_ through the SMOG test ~ so clean in fact they had me bring it to a "TEST ONLY" SMOG station when once again it easily passed .

Here in California the holy grail is anything 1974 and older .

In pickups it's the short beds .

OI agree, if you like it DON'T SCRAP IT .

I didn't bother asking about that old van because I didn't want the damn thing, not even free .

I have to be careful as too many want me to tow away any old dead vehicle .
__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better
Reply With Quote
  #66  
Old 08-25-2022, 08:15 PM
cmac2012's Avatar
Renaissances Dude
 
Join Date: Dec 2004
Location: Redwood City, CA
Posts: 33,916
They were talking about top dead center. Does that work whether it’s the exhaust or combustion stroke? I mean does it matter which stroke it is? Seems like it would.
__________________
1986 300SDL, 362K
1984 300D, 138K
Reply With Quote
  #67  
Old 08-25-2022, 08:41 PM
INSIDIOUS's Avatar
Not suffering fools today
 
Join Date: Jan 2014
Location: Tartarus Dorsa Mountains
Posts: 30,350
Quote:
Originally Posted by cmac2012 View Post
They were talking about top dead center. Does that work whether it’s the exhaust or combustion stroke? I mean does it matter which stroke it is? Seems like it would.
LOL. Now you tell us ! You got stuck with one of them there 4 cycle jobbers. The 2 cycles are way better. Sure you have to mix oil, but they sound like a chain saw
Reply With Quote
  #68  
Old 08-26-2022, 09:14 AM
cmac2012's Avatar
Renaissances Dude
 
Join Date: Dec 2004
Location: Redwood City, CA
Posts: 33,916
I had a cousin of a two stroke automobile one time. A 1967 Saab 96 with a four stroke Ford V4. Formerly used in forklifts. Several years before that it was powered by a three cylinder two-stroke. You had to be careful you didn’t melt the pistons or something. Never even heard one run, let alone drive or rode in one. I gather they were a handful to deal with, had some sort of freewheeling feature.
__________________
1986 300SDL, 362K
1984 300D, 138K
Reply With Quote
  #69  
Old 08-27-2022, 01:44 PM
vwnate1's Avatar
Diesel Dandy
 
Join Date: Nov 2005
Location: Sunny So. Cal. !
Posts: 7,717
Post Old SAABS & TDC

Oh yeah ~ Pops bought a brand new SAAB station wagon in.....1964 ? something like that, it had the two cycle engine and didn't have any method to inject the two cycle oil like all Yamaha Motos did at that time, every time you filled it with gasoline you had to pour oil in the fuel tank an d bounce the car by the rear bumper to make it mix .

It didn't sound too weird as it was well muffled .

The free wheeling as nice, it allowed clutchless up shifts but also could kill you going down steep hills .

Since one is expected to replace both vale stem oil seals oer cylinder at the same time, I'd use TDC instead of the exhaust or intake strokes, might as well hold both valves closed .
__________________
-Nate
1982 240D 408,XXX miles
Ignorance is the mother of suspicion and fear is the father

I did then what I knew how to do ~ now that I know better I do better
Reply With Quote
  #70  
Old 09-18-2022, 06:55 PM
INSIDIOUS's Avatar
Not suffering fools today
 
Join Date: Jan 2014
Location: Tartarus Dorsa Mountains
Posts: 30,350
I have a quizzical for you. The gaskets under and above the tbi housing (can) how do they look as to condition? The upper is the air filter housing gasket and easily sourced for under 2$ ( plush shipping if your local peeps don't stock it)

But what is up with that lower leaky thing? Is that a rubber o-ring? what is the part numba fo dat?
Reply With Quote
  #71  
Old 09-21-2022, 01:45 PM
cmac2012's Avatar
Renaissances Dude
 
Join Date: Dec 2004
Location: Redwood City, CA
Posts: 33,916
Not sure what you mean by lower leaky thing. Did I say something about that, I forget?

A few years ago I got the throttlebody repair kit and went through the procedure. There were a couple of steps that I was unsure about, just did not make sense, and I couldn’t find any info to help me, so I put it together best I could figure and it ran well. The gaskets that you speak of were included of course.

Still I wonder if I should go for a major renewal in that department. Here is something from our friends with perhaps the catchiest TV jingle ever:



I think I will ask my mechanic buddy his advice. I am getting less and less inclined to tackling complicated jobs for the first time ever. A lot of stuff I will still do, and I’m not opposed to a learning curve, I just hate being in the middle of something and really feeling like I’m spending hours and hours to F it up.
__________________
1986 300SDL, 362K
1984 300D, 138K

Last edited by cmac2012; 09-22-2022 at 12:09 AM. Reason: good? That word did not belong there.
Reply With Quote
  #72  
Old 09-21-2022, 06:00 PM
Registered User
 
Join Date: Sep 2001
Posts: 2,765
TDC exhaust or compression works but compression is best because it makes more room for error when adjusting the valves as the cam is on the base circle. TDC compression can be determined by putting #1 at TDC and then moving the crank slightly in either direction.
No rocker arm movement =
#1 on compression stroke,
movement = #1 on exhaust stroke and
#6 on compression stroke.

__________________
"Rudeness is a weak man's imitation of strength" - Eric Hoffer
Reply With Quote
Reply

Bookmarks

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On
Trackbacks are On
Pingbacks are On
Refbacks are On




All times are GMT -4. The time now is 11:24 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2024 Pelican Parts, LLC - Posts may be archived for display on the Peach Parts or Pelican Parts Website -    DMCA Registered Agent Contact Page