Your First Engine Job - Pulling The Head And Assessing The Damage
38,207
Published 2023-01-16
#classiccar #engines #autorepair #musclecar
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All Comments (21)
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2 suggestions...... 1:more videos like these .... I like the investigative process finding what is bad and good 2: get a small LED light when filming.... a small light would have lit that #1 cylinder so we could see the condition . just FYI. :)
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In Australia a 6 cylinder Ford 4.1 liter was only $500 to $1000 most of them were new heads, all the best to yous and your loved ones
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When I rebuilt my ford 300 inline 6 engine, I tried to get a remanned head but they were and are still unavailable. Mine was cracked so I had to go buy one from a salvage yard and get it machined. When it was all said and done it was actually cheaper or about the same as a remanned head. So, while yes a remanned head will save you time and maybe some money, the availability is something to take into consideration.
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The bolt stretch is 100% correct, this happens when the bolt's yield (and likely ultimate tensile) strength is exceeded and it begins to neck. It will lengthen at the expense of diameter and that relationship is described by Poisson's ratio. My materials class finally coming in handy :D
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That motor was ran into the ground. Then it looks like all sorts of rebuild kit in a can gunk was fed into it and ran into the ground some more
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The "blocked water passages" that you pointed out are not water passages. They are sand casting drain holes. They are only there for sand removal after the casting process. As you can see, the head gasket does not have through holes for those "blocked water passages". The only water passages that are active on this engine are the two in the very rear, the one circular hole in the very front and the small 6 holes on the cam side for each combustion chamber.
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I've got a 1968 jaguar 3.8 that's locked up. It's been soaking for months and I've finally resigned myself to having to open it up. Looks like I'll be watching this series of UTG on repeat over the upcoming winter. (Southern Hemisphere) Looking forward to it if I'm honest
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What's in the inlet port is also EGR and PCV residue.
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4:23 I would lean more towards PCV dumping into the front half of the intake.
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That gas trick is smart, im so used to sending heads out at the shop I work at. This is great for DIYer's
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Thanks UTG - I liked the gas in the combustion chamber testing for valve leaks
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PLEASE add something in the description or title that indicates which number in the series these videos are. I'm thinking about those that may stumble on to this invaluable series years from now, and the importance of easily identifying which video is next. Excellent channel! I've rebuilt one engine so far, an International Harvester 345 V8. My daily driver is a '98 Jeep XJ with a 4.0 so I'm especially interested in this series.
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I agree just order a reman head. Be way ahead in time and money. But I understand you're using this as a teaching part.
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best down to earth explanation of bolt stretch i have ever seen...nice...
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soaking in all the practical knowledge you share, thank you.
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When checking the seal of the valves I like to put the gas in the runners not the chambers. The test is the same. But I think it's just a bit easier to watch the valves weep.
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good job uncle tony sir.!.
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According to the FSM on 4.0’s if you reuse head bolts they should be marked. Marked head bolts should be discarded and replaced when removed. Since 4.0s are subject to overheating I suspect that head has been off a time or two and the bolts weren’t replaced.
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Great advice on getting a reman head if the teardown sees trouble. I once had a Chevy Cavalier that needed valves ground. Due to cracks between the spark plug and exhaust valve (those engines were known for them) It took 3 heads to get one that was good enough for the machine shop to rebuild...by which time I had almost exactly the cost of a reman head in it.
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Thank you Uncle Tony for this, I have a 99 XJ myself and Im planning on keeping her as long as I can and I know there will come a time that this may happen.
