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keith___
Bone Stock
Posts:0
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| 03/29/2002 2:27 PM |
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Hello - My wife's 1993 Toyota truck (22R-E) began to overheat, almost into the red on the gauge, sudden coolant loss. It then developed a stumble at idle. The coolant loss was soon explained by evidence of coolant/oil mixing on the dipstick. Blown headgasket, right?
So I pull it apart, and go after the gasket. Everything is chocolate milk in there, but I can't find physical evidence of the headgasket being blown... Take the head to a machine shop for a rush job of flattening the gasket sufaces, pulling a vaccuum on the ports to ensure the valves don't leak and replacement of the stem seals. Clean up the block, no cracks visible, and reinstall. By the next day it is clear that the oil/coolant mixing continues, as bad as before.
So I pull out the compression tester to try to get an idea of where the problem is. Here are the results (cold engine): #1 - 188, #2 - 183, #3 - 179, #4 - 176.
My question is this: Is the headgasket the only place for mixing to occur? My other car has a common failure of the oil cooler seals, allowing mixing. I am wondering if I am missing something, or if I screwed up the headgasket job (will have been my first screwup, if so), or if there could be hidden crack damage in head or block that would escape visual inspection and compression test that would account for the mixing? I wouldn't be so hesitant to go intere, save for the lack of obvious damage to the original headgasket...
I suppose I need to do a leak-down test before I proceed? Will this tell me anything in this situation? Any advice? This is starting to cost me in time and parts... Ugh.
TIA.
BTW, the only damage I could find in the motor was the timing chain gouging grooves in the inside of the timing cover, where it had worn through the guide somewhere in its 150,000 miles. (Replaced the chain, sprockets, guides, of course...) |
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steve
Bone Stock
Posts:1
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| 08/03/2006 3:08 PM |
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Same thing happened to my sons 1992 22r. Pull the valve cover and presureize the coolant system. Look for your coolant leak using a strong flash light down the timing chain on the water pump side. On my sons 22r we could see a stream of coolant squirting thru a pin hole in the water pump right into the timing chain area. Good luck.
Steve |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 08/03/2006 7:12 PM |
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Great tip Steve! Thank you.
Rick |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
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'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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slopjar
Bone Stock
Posts:3
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| 02/14/2007 3:19 PM |
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quote:
Originally posted by keith___
Hello - My wife's 1993 Toyota truck (22R-E) began to overheat, almost into the red on the gauge, sudden coolant loss. It then developed a stumble at idle. The coolant loss was soon explained by evidence of coolant/oil mixing on the dipstick. Blown headgasket, right?
So I pull it apart, and go after the gasket. Everything is chocolate milk in there, but I can't find physical evidence of the headgasket being blown... Take the head to a machine shop for a rush job of flattening the gasket sufaces, pulling a vaccuum on the ports to ensure the valves don't leak and replacement of the stem seals. Clean up the block, no cracks visible, and reinstall. By the next day it is clear that the oil/coolant mixing continues, as bad as before.
So I pull out the compression tester to try to get an idea of where the problem is. Here are the results (cold engine): #1 - 188, #2 - 183, #3 - 179, #4 - 176.
My question is this: Is the headgasket the only place for mixing to occur? My other car has a common failure of the oil cooler seals, allowing mixing. I am wondering if I am missing something, or if I screwed up the headgasket job (will have been my first screwup, if so), or if there could be hidden crack damage in head or block that would escape visual inspection and compression test that would account for the mixing? I wouldn't be so hesitant to go intere, save for the lack of obvious damage to the original headgasket...
I suppose I need to do a leak-down test before I proceed? Will this tell me anything in this situation? Any advice? This is starting to cost me in time and parts... Ugh.
TIA.
BTW, the only damage I could find in the motor was the timing chain gouging grooves in the inside of the timing cover, where it had worn through the guide somewhere in its 150,000 miles. (Replaced the chain, sprockets, guides, of course...)
could this be the timming chain rubbing a hole in tc cover??? |
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webby4x4
Forum Admin, Magazine Editor
Rock Star
Posts:2375
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| 02/14/2007 4:12 PM |
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| yup... that, or rust, but most likely the timing chain rubbing a hole. |
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Rick Webster
Editor, 4X4REVIEW.COM - A Tork Media, Inc. Publication
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'74 FJ40 Land Cruiser
"Measure once, cut twice" |
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spork_the_mortals
Bone Stock
Posts:2
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| 01/04/2008 12:48 AM |
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Hi, I'm sitting here, heartbroken from a 22RE rebuild. I just finished a rebuild on a friend's '87 4Runner. The head was decked and checked, block scoped out, we did everything, including buy a new timing chain kit with the steel-backed guide. We took the thing out for its ring-seat run, came back, shut it off to do the hot valve adjust and there it was...thick, white foam inside the valve cover, over the timing chain area. It was also on the dipstick. Seriously, I almost wanted to cry; I have rebuilt countless dozens of import engines (I've brought many Sentras and Pulsars back to life), this is my first Toyota.
In hindsight, I completely neglected the timing cover; There are two grooves on the left inside where the chain plates rubbed and they're deep. Saturday I'll pull the valve cover again, pressurise the cooling system and check it; Dollars to donuts it's the timing cover. At least it's better than pulling the head only to find it's not the head gasket, eh? Thank you SO much for this thread! This came up when I Googled the issue, found how you guys found out about it and I wanted to thank you. Your discoveries, albeit the hard way, made a difference! |
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fourwd1
Street Queen
Posts:57
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| 01/04/2008 9:53 PM |
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| Yeah, the stretched TC wearing a hole thru the cover fools a lot of people. The TC slap noise usually tips you off soon enough to prevent it though. |
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- as seen in Four Wheeler magazine July 2006, Off-Road magazine Feb 2007
'84 4Runner SR5 - ARBed 5.29's F&R, 4.7 & 2.28 t-cases, drv trn lift, Chevy's, 30 spline Longs, BudBuilt skid, 36" TSLs... |
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spork_the_mortals
Bone Stock
Posts:2
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| 01/07/2008 10:58 AM |
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The cover's off as of this morning and sure enough: There were two pinholes evident between the water pump recess and the timing chain side. Use of a jeweler's screwdriver easily enlarged the passage to 1/16 inch by 3/4 inch long. An eBay vendor I trust, cns auto, had the cover for $29+shipping, so it'll be here by week's end.
My friend was upset by this whole matter, so I told him that first off, we caught the issue before it could cause any damage; Second, I was the one to blame, being the chief mechanic and not taking this matter seriously. Third, at least his engine is now fresh and ready to stomp around for another 150-odd-thousand miles. Fourth, this was a lesson we both learned without too much 'tuition' involved.
Fifth: I didn't charge him a dime to do this whole job. |
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fourwd1
Street Queen
Posts:57
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| 01/09/2008 7:08 PM |
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quote:
[i]...
Fifth: I didn't charge him a dime to do this whole job.
In that case feel free to come work on my trucks.[^] |
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- as seen in Four Wheeler magazine July 2006, Off-Road magazine Feb 2007
'84 4Runner SR5 - ARBed 5.29's F&R, 4.7 & 2.28 t-cases, drv trn lift, Chevy's, 30 spline Longs, BudBuilt skid, 36" TSLs... |
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LogiTech
Bone Stock
Posts:5
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| 10/11/2010 9:19 PM |
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Thanks for this post mate! This should help me a lot. Anyway, could you have check the price of this Cylinder Head Gasket Set..? is it reasonable enough?? Im at Carson and thought so that I would not have to spend much bucks on the shipping. Thanks again mate..
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ranatonga42
Bone Stock
Posts:3
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| 02/03/2012 6:47 AM |
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I wanted to say that it's nice to know that someone else also mentioned this as I had trouble finding the same info elsewhere. This was the first place that told me the answer nts
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samsmith
Bone Stock
Posts:27
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