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post #1 of (permalink) Old 01-30-2004, 07:11 PM
vols
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Some newbie questions

what up brohams, i have a problem with my jeepster. i recently put a new 195 degree thermostat and a new 13 lbs radiator cap on and since then i have had problems with the radiator leaking,...from what i can tell its leaking from where the top of the radiator is connected to the body of the radiator (its got a plastic top on it). i'm starting to think that the cap is to blame. the old cap (16lbs) had no pressure to it, no matter how hot the engine got i could unscrew the cap and there would be no pressure release so i put on the old cap on and had no problems,...i guess my question is, should i just put the old cap on and have no pressure but at least no leaking or i should i try another cap?

my other problem is that i am constantly having to fill up the jeep with oil but i cant find any leaks,.. i checked the oil pan, valve cover gasket and dont know where else to look. help!
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post #2 of (permalink) Old 01-30-2004, 07:23 PM
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Re: Some newbie questions

1. Replace/Repair the radiator.
2. Have you checked for blow-by?
3. Are the plugs oil fouled?
4. Is there oil residue in the tailpipe?
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post #3 of (permalink) Old 01-30-2004, 09:57 PM
 
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Re: Some newbie questions

you need the pressure in the coolant system...it helps keep your engine from turning into a big, expensive kettle...

as for the oil, do a dry then wet compression check (and at the same time check your plugs as LEVE suggested)...if the compression is low when dry then improves with the wet test, you may have bad rings, allowing oil into the cylinder...
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post #4 of (permalink) Old 02-06-2004, 02:11 AM
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Re: Some newbie questions

i put new plugs in about three weeks ago and the engine ran so much smoother but now its back to crap. i checked the plugs and they have this white/tan stuff on them,..i can chip it off with my finger and the threads do have oil on them. you asked about the tailpipe, it has a thick layer of what resembles black soot. i need some advice on what to do about this, the enging itself sounds bad,..its has two or three knocks and rattles that worry me.
post #5 of (permalink) Old 02-06-2004, 08:26 AM
 
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Re: Some newbie questions

if you were getting oil into your cylinders then your plugs should be darker than what you describe...do the compression test anyway and write the numbers down in the front cover of your haynes manual...it's useful information to have...

i would also check the rear main seal (where the engine mates to the tranny) for your oil loss...they've been known to leak a little here and there [img]images/graemlins/wink.gif[/img] ...by "constantly fill it up with oil", just how much do you mean? a quart per week? per oil change?
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post #6 of (permalink) Old 02-06-2004, 09:26 AM
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Re: Some newbie questions

1. I doubt it's oil,
2. The plugs are not fouled.
3. But the residue in the tail pipe...
4. Is it:[*]Oily when rubbed between the fingers?[*]Feel "velvety" when rubbed between the fingers?
5. I suspect it's got that velvety feel,
6. Which is raw unburnt fuel,
7. Which is being blown out the exhaust.
8. IF this is the case,
9. The engine's running WAY too rich.
10. As for the knocks...
11. You've got to be more specific.
12. Such as:[*]What part of the engine are they coming from[*]Are they deep knocks,[*]Or like pebbles rolling in a coffee can?[*]Do they increase/decrease with engine speed?[*]Are they worse on a hill?[*]Do they go away when coasting?
13. Low, hard knocking usually is a rod or main bearing.
14. Higher knocking usually is a problem in the cam/valve train.
15. Try isolating the knock to a cylinder,
16. By pulling a plug wire off one plug at a time.
17. If the knock goes away,
18. You've found the cylinder associated with the knock.
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post #7 of (permalink) Old 02-06-2004, 09:27 AM
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Re: Some newbie questions

if you have a black ring around the end of the tailpipe you are running rich as well, check the o2 sensor
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post #8 of (permalink) Old 02-06-2004, 05:45 PM
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Re: Some newbie questions

I changed the oil about 1500 miles ago and since then I have put in 1 quart and it needs a little more. As for the rear main seal, visually it seems fine to me but I havent taken anything apart. The tailpipe residue is definately velvety and i'm wondering what you guys mean by being to rich?

I dont get how I can lose that much oil with no visible leaks and without the engine smoking like a freight train.
post #9 of (permalink) Old 02-06-2004, 06:55 PM
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Re: Some newbie questions

</font><blockquote><font class="small">In reply to:</font><hr />
The tailpipe residue is definately velvety and i'm wondering what you guys mean by being to rich?

[/ QUOTE ]1. The Computer is requesting too much fuel.
2. It's being dumped into the cylinders,
3. But NOT Being completely combusted.
4. That's a Rich condition.
5. Now, you've got to find out why it's running rich.
6. That means pulling computer codes,
7. Checking you're emissions sensors[*]02 sensors[*]MAF/MAS sensors[*]Coolant Temperature Override sensor[*]TPS sensor[*]Idle Speed Motor
8. Those are the items that make up the heart of the management system.
9. You'll need a manual and a VoltMeter...
10. And start test things out! </font><blockquote><font class="small">In reply to:</font><hr />
I dont get how I can lose that much oil with no visible leaks and without the engine smoking like a freight train

[/ QUOTE ]11. Yes, that does seem excessive,
12. Start watching for oil being blown out at engine start up,
13. And watch your coolant level,
14. Then also look for leaks around the engine...
15. You may have to clean it off before you'd ever see it...
15. Oil doesn't just disappear,
16. It's either[*]Leaked[*]Combusted[*]Ingested, and NOT combusted[*]leaked into the crankcase.
17. There ain't many other places it can go.
18. The plugs aren't oil fouled,
19. So that rules out ingested in the cylinders.
20. So start looking for a leak...
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post #10 of (permalink) Old 02-09-2004, 09:41 AM
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Re: Some newbie questions

If the engine runs very rich, the oil film will be washed from the cilinderwalls. Maybe not enough to make the plugs and tailpipe greasy, but enough to see the level drop. Otherwise this Jeep should mark it's place everywhere.
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