| Author |
Message |
    
gp (Garrett)
| | Posted on Wednesday, April 24, 2002 - 07:49 pm: | 
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Well i just got back from doing a compression/leak down check on my truck. well at least the left bank of cylinders. and word has it #1 cyl. is at 120 and #7 is at 140. the others are about right.....155.
according to the mechanic it is the rings. not the valves. this was determined by how the compression was lost after applied.
now i know why my truck is getting blown away by Suzuki Swifts these days.
any input apprectiated. |
p m
| | Posted on Wednesday, April 24, 2002 - 08:14 pm: |
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Garrett,
you can ask your mechanic again on how did he do the compression test.
normally, you do it twice, once dry, another time with a little oil added through the spark plug hole. If it's blown rings, oil will seal it a bit, and compression readings will increase. If it's valves, oil won't change a thing.
FWIW - i drove the jeep with 90 and 110 in two jugs, and 155-160 in all others. not pretty, but it could live for another couple of years.
peter |
gp (Garrett)
| | Posted on Wednesday, April 24, 2002 - 09:48 pm: |
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well i don't remember exactly how he did it, but i am pretty sure he did it three times on each cylinder. and depending on where the air was 'leaking' from that determined (not 100% though) what was likely to fault. i.e. oil filler, dipstick, etc. or how fast it was loosing pressure. i was there for a little bit going over things with him, but this is somewhat what i remember.
i have a warranty on the truck, but the only catch is that it does not cover replacing rings for the sake of gaining compression. this is considered 'wear and tear'. but i am pretty sure if i really wanted to get it done my local mechanic would fudge a few things to get it done.
i am driving 8 hours to NC this weekend. truck drives good and all, but the added weight or our gear and new tire/wheel combo it will be a little harder than the others maybe.
thanks |
p m
| | Posted on Wednesday, April 24, 2002 - 09:51 pm: |
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Garrett,
it is not replacing gears for the sake of gaining compression. It would be if you had even 120psi across the board, but low values in 2 jugs indicate more severe problems. It will eventually lead to consistent misfire, burnt cats, damaged O2 sensors, etc. I would try arguing it with them.
at least, there's somebody you can argue with 
peter |
gp (Garrett)
| | Posted on Thursday, April 25, 2002 - 08:14 am: |
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thanks peter. i can't really get around to getting this done for a few weeks yet. not sure if my local mechanic down the street wants to tackle this. has a very small setup and this would keep his main mechanic 'out' for a good week. so we shall see. but either way i would like to have this all taken care of......if it means rebuilding the heads or the bottom half of the motor. |
Ron
| | Posted on Thursday, April 25, 2002 - 10:03 pm: |
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$5 says it is valves
Ron
Note: alyssa blew a head gasket last year on the way to uwharrie. That drive will test it. |
p m
| | Posted on Thursday, April 25, 2002 - 10:37 pm: |
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Ron,
that's something i would really hope for.
my personal luck was different
peter |
Ron
| | Posted on Friday, April 26, 2002 - 02:03 am: |
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Care to take me up on that wager Peter?
A WEEK! valve job should be a day, two tops.
CHECK THE HEADS FOR WARPAGE!
Watch them check. Most places will not have a mechanics strait edge. Make them get one or bring your own.
Ron |
weespeed
| | Posted on Friday, April 26, 2002 - 04:12 am: |
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I see that your mechanic did a leakdown test, that should have told him for sure if it is the rings or the valves. If while doing the leakdown, and you can hear air going through the exhaust or the throttle body then it's the valves, if you hear air through the crankcase via the oil dipstick or usually the crankcase breather, then it's the rings. Ask him by what percentage was the two cylinders leaking. Usually, a stock motor should be within 2 to 8% leakage, anything more time to rebuild. It's not a must, but remember that those two cylinders will be producing less power, making the others work harder, which leads to eventual engine failure, but that happens over time. |
doug james (Dgj95lwb)
| | Posted on Friday, April 26, 2002 - 07:17 pm: |
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gp:
If it was performed correctly, ie 'fer sure it's the rings', then you are in for a major really.
All the rings have the same amount of work behind them. This means all should have to be replaced at the same time.
If you do not do the heads as well, then the newly found higher pressures will work on the valves, which are more failure prone than the rings.
Seems to me there's no end in sight, once you start. So, bite the bullet and do the works. Total mi you have done are not mentioned, but if 140-150k, you can expect some major replacements. It's the nature of IC engines and their engineering. Do a new cam, cam gear and chain, needless to say. CC the heads, balance everything
reciprocating. New valves, and maybe stroke it. 4.6 time ? Trans time ? RPI, yes !
Roughness and being whipped by the nubrias of the world is quite the disgrace. cheers- doug |
gp (Garrett)
| | Posted on Monday, April 29, 2002 - 07:58 am: |
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i would love to do some of the things some of you have mentioned. i do have the warranty, so repairing some of the issues will not be a problem.
but something else came up this weekend on my 1100 mile RT drive this weekend from NC.
i went to put some oil in the truck on the way home and noticed antifreeze on the oil filler screw threads and neck.
soooooooo looks as though the head gasket is to blame for this. maybe this was the issue all along?
thanks for all the input. |
gp (Garrett)
| | Posted on Monday, April 29, 2002 - 10:04 am: |
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ok think that green fluid was just the dye from the leak down test now. so back to the compression issue. |
Paul T. Schram (Paulschram)
| | Posted on Monday, April 29, 2002 - 10:11 am: |
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If you have coolant in the oil, the life expectancy of your engine can be measured without the assistance of a calendar or your odometer.
Stop driving the truck, drain the oil and coolant now! Replace both and drive to where you wish to have it serviced.
I broke a crankshaft in another truck due to bearings being attacked by the coolant.
Peace,
paul |
gp (Garrett)
| | Posted on Monday, April 29, 2002 - 10:54 am: |
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the leaking of air was coming from the dipstick and breather in cylinders #1 and #7. getting 120 from #1 and 140 from #7. not within the 10%. having him do the other bank of cylinders next week when i get back from Assateague. only problem is getting the warranty company to cover it. i think some creative writing should solve that. i would love to drop a 4.6 in the truck. just don't see them doing that. haha. thanks all. |
p m
| | Posted on Monday, April 29, 2002 - 04:16 pm: |
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Garrett,
please post what you find out (before i lose my winning CA lottery ticket to Ron)!
i guess if the heads are off for a valve job, it doesn't take long for a quick hack job on two cylinders' rings.
peter |
gp (Garrett)
| | Posted on Tuesday, April 30, 2002 - 09:41 am: |
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will do. i think the truck is burning a bit of oil too. guessing that the overworked other cylinders are burning it up a little more than usual.
once i get the other bank of cylinders checked for compression i will be attempting to get the warranty company to cover it. i cannot see how they cannot.
it would be great to be able to get the heads done at the same time. we shall see what happens. wouldn't mind slapping in some new cams, new valves and rockers. hell why don't i just bore it out while we're in there. now we're talking!! |
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