@franktib Not if you ever want it to seal up again. :( A wire wheel leaves deep scratches in any metal, and that will cause the head gasket to leak. Even a scotch brite pad is too abrasive. The vertical razor blade method is the best way to do it if you're not going to tank the block. You could use a nylon brush and lots of elbow grease with soapy water if you are... but me, personally... I would never use a power tool for this part of the job.
@Jafromobile not if you ever want it to seal up again? thats pushing it. yes i have seen people get pretty aggressive with wire wheels but ive been using them for years on the deck & the aluminum gasket surface of the head. I have never blown a headgasket in my turbo engine. with care u absolutely can use them on a daily driver. maybe they are not the best thing for blueprinted engine but 99.9% of race engines are gonna get decked anyway. on a non OHC engine i would always deck it
@franktib The reason I sounded like such a totalitarian about the wire wheel is the prevalence of the MLS gasket in the DSM community, whether cometic or otherwise. Lots of DSMers have problems making it seal. Both surfaces must be truly flat in order for it to be reliable. Scratches on the deck surface have a much greater effect on the MLS than they would with a composite gasket. Even copper spray will ruin its sealing properties, so that's the main reason I'd never ever use a wire wheel.
@Jafromobile I see ur point. I am considering a cometic headgasket. i wonder what finish they perfer on the deck surface with a cometic? factory spec for my application is 100 micro inches with a composite hg
@gearheaderic Nothing happened to this one. The 7-bolt is up next.
I did the 6-bolt first because I knew there's no way I could be patient enough to test all this on camera while trying to figure out what's wrong with it. I know all my new measurement tools work, and you got a chance to see the process and a good comparison to a good reference in regular time. I'm not dragging out the 7-bolt.
So when I find something wrong, everyone will know why. I won't have as much 'splainin' to do .
@gearheaderic Don't worry, I'll have a nice little christmas present for everybody. It took an act of congress to get the Colt and GSX swapped out of the garage, the 6-bolt's going out, and the 7-bolt's on the stand. I've had 3 christmas parties and a wedding in the past 2 weeks. This schedule has been hard on a 1-man production crew. The good news is I've got my broken tools replaced, a fresh box of kitty litter, my tools and supplies are laid out and that video could happen any moment.
Great video yet again Jafro! If it really isn't too much trouble I would really like a tear down video of the 7bolt and a true diagnosis. Definitely doesn't have to be as detailed as the 6 bolt check but I will be building my 7bolt soon and would really like a visual aide as far as checking everything. I'm sure I'm not the only one so do your subscribers a favor and please make the video!
@MercenaryX2 So much in store the first thing I need to figure out is what to do next? I have a 7-bolt in need of a tear-down... a Colt that needs a crossmember and driveshaft... and I just had a lucrative weekend in the junkyard. I have some bills to pay, but will be back swingin' for another round very soon.
The 7-bolt could be a series in itself... but why? Is there value in inspecting it (like the 6-bolt) to see what it looks like after 48,000 miles with JE's and Mobil1 Synthetic?
@mbopm So the solid-decked cast iron block is stronger all the way around than a sleeved aluminum block. Sure it traps heat, but there's more material to absorb it while its higher melting point makes it ideal for a turbo setup. Iron absorbs less of the heat from the combustion chamber than aluminum will, so more of the heat goes out the exhaust..
One inarguable fact: The heater in a DSM works 5x better than any Honda. And it's still warm an hour after you've stopped driving it. (ツ) b
@mbopm The more I look at your question the more I realize I have your answer!
Aluminum is a great heat sink, but there's two problems with the Honda design in that regard. Aluminum has a lower melting point than iron, gets softer at a lower temperature and warps more easily. The other problem is the lack of available material around the combustion chamber to absorb the heat. When you put steel sleeves in an aluminum block you add a material that traps the heat while reducing coolant flow.
Easy to follow and understand including the annotations on the verbal mistake which when dealing with tenths and thousandths is an easy one to make when explaining things. I think your videos should be included in the library of congress doomsday vault. They are that good. Couple questions though. Why clean the gasket and measure the mating surface. Isn't that something a machine shop will do anyway or no?
@DJDevon3 I could make a whole video about this. The machine shop isn't going to check for it like this. They're going to jig the block on a mill and take off a few thousandths until the surface imperfections are gone. What if you take them a block that essentially doesn't need it? They're gong to do it & bill you for it. They also might remove more on the first pass than you needed removed in the first place. It's always better to have this data prior to discussing your build.
@Jafromobile People say they replaced a head gasket last weekend as if it's an easy thing to do. Do most people slap it back on without doing a surface cut for a blown gasket? How do you know when to do both the top and bottom surface if all you want to do is replace the gasket? Does it really matter? Is it possible to do the old gasket removal in-place? Deciding between a new/used engine or rebuild can be a fine line. Please do make a video about it and anything else you want really. :)
@DJDevon3 The service limit for a cylinder head is .002". The deviation in this video was .0005", or 1/4 of the way to the service limit. Really I don't have to get it resurfaced if I wanted to just slap another composite gasket back in there... but if I wanted to put a MLS gasket in there instead, then both surfaces must be perfectly flat.
A composite gasket is more flexible and forgiving. You could get away with it if the head ins't warped out-of-spec.
can i just use a wire wheel on the deck surface?
franktib 1 month ago
@franktib Not if you ever want it to seal up again. :( A wire wheel leaves deep scratches in any metal, and that will cause the head gasket to leak. Even a scotch brite pad is too abrasive. The vertical razor blade method is the best way to do it if you're not going to tank the block. You could use a nylon brush and lots of elbow grease with soapy water if you are... but me, personally... I would never use a power tool for this part of the job.
Jafromobile 1 month ago
@Jafromobile not if you ever want it to seal up again? thats pushing it. yes i have seen people get pretty aggressive with wire wheels but ive been using them for years on the deck & the aluminum gasket surface of the head. I have never blown a headgasket in my turbo engine. with care u absolutely can use them on a daily driver. maybe they are not the best thing for blueprinted engine but 99.9% of race engines are gonna get decked anyway. on a non OHC engine i would always deck it
franktib 1 month ago
@franktib The reason I sounded like such a totalitarian about the wire wheel is the prevalence of the MLS gasket in the DSM community, whether cometic or otherwise. Lots of DSMers have problems making it seal. Both surfaces must be truly flat in order for it to be reliable. Scratches on the deck surface have a much greater effect on the MLS than they would with a composite gasket. Even copper spray will ruin its sealing properties, so that's the main reason I'd never ever use a wire wheel.
Jafromobile 1 month ago
@Jafromobile I see ur point. I am considering a cometic headgasket. i wonder what finish they perfer on the deck surface with a cometic? factory spec for my application is 100 micro inches with a composite hg
franktib 1 month ago
Excellent videos, very understated, really appreciate your work in making these videos, i'm subscribed.
KristoffersonPT 2 months ago
don't powder coat it, the filth is the new in thing man! ;)
Running925 2 months ago
5:25 best part of the entire series lol. Great work on these vids though, seriously.
mazzmari 3 months ago
5.25 i choked on me feckin turkey laughing! Jafro dubstep. Nice video lad,informative and thorough as always:-)
TrueBlueEG8 3 months ago
so wat exacly happened to the motor?
gearheaderic 3 months ago
@gearheaderic Nothing happened to this one. The 7-bolt is up next.
I did the 6-bolt first because I knew there's no way I could be patient enough to test all this on camera while trying to figure out what's wrong with it. I know all my new measurement tools work, and you got a chance to see the process and a good comparison to a good reference in regular time. I'm not dragging out the 7-bolt.
So when I find something wrong, everyone will know why. I won't have as much 'splainin' to do .
Jafromobile 3 months ago
@gearheaderic I either crankwalked it or spun a rod bearing. Either way, it's bad.
Jafromobile 3 months ago
@Jafromobile oh ok thanks i have been waiting for a video on the tear down just to see wat failed on the 7
gearheaderic 2 months ago
@gearheaderic Don't worry, I'll have a nice little christmas present for everybody. It took an act of congress to get the Colt and GSX swapped out of the garage, the 6-bolt's going out, and the 7-bolt's on the stand. I've had 3 christmas parties and a wedding in the past 2 weeks. This schedule has been hard on a 1-man production crew. The good news is I've got my broken tools replaced, a fresh box of kitty litter, my tools and supplies are laid out and that video could happen any moment.
Jafromobile 2 months ago
Great video yet again Jafro! If it really isn't too much trouble I would really like a tear down video of the 7bolt and a true diagnosis. Definitely doesn't have to be as detailed as the 6 bolt check but I will be building my 7bolt soon and would really like a visual aide as far as checking everything. I'm sure I'm not the only one so do your subscribers a favor and please make the video!
bradikus7 3 months ago
Happy thanksgiving Jaf.
Now when you say you're making room in the garage, I wonder what you mean by that... Got something instore for us?
MercenaryX2 3 months ago
@MercenaryX2 So much in store the first thing I need to figure out is what to do next? I have a 7-bolt in need of a tear-down... a Colt that needs a crossmember and driveshaft... and I just had a lucrative weekend in the junkyard. I have some bills to pay, but will be back swingin' for another round very soon.
The 7-bolt could be a series in itself... but why? Is there value in inspecting it (like the 6-bolt) to see what it looks like after 48,000 miles with JE's and Mobil1 Synthetic?
Jafromobile 3 months ago
Re re remix!!!
iconone5 3 months ago 2
@mbopm So the solid-decked cast iron block is stronger all the way around than a sleeved aluminum block. Sure it traps heat, but there's more material to absorb it while its higher melting point makes it ideal for a turbo setup. Iron absorbs less of the heat from the combustion chamber than aluminum will, so more of the heat goes out the exhaust..
One inarguable fact: The heater in a DSM works 5x better than any Honda. And it's still warm an hour after you've stopped driving it. (ツ) b
Jafromobile 3 months ago
@mbopm The more I look at your question the more I realize I have your answer!
Aluminum is a great heat sink, but there's two problems with the Honda design in that regard. Aluminum has a lower melting point than iron, gets softer at a lower temperature and warps more easily. The other problem is the lack of available material around the combustion chamber to absorb the heat. When you put steel sleeves in an aluminum block you add a material that traps the heat while reducing coolant flow.
Jafromobile 3 months ago
Easy to follow and understand including the annotations on the verbal mistake which when dealing with tenths and thousandths is an easy one to make when explaining things. I think your videos should be included in the library of congress doomsday vault. They are that good. Couple questions though. Why clean the gasket and measure the mating surface. Isn't that something a machine shop will do anyway or no?
DJDevon3 3 months ago
@DJDevon3 I could make a whole video about this. The machine shop isn't going to check for it like this. They're going to jig the block on a mill and take off a few thousandths until the surface imperfections are gone. What if you take them a block that essentially doesn't need it? They're gong to do it & bill you for it. They also might remove more on the first pass than you needed removed in the first place. It's always better to have this data prior to discussing your build.
Jafromobile 3 months ago
@Jafromobile People say they replaced a head gasket last weekend as if it's an easy thing to do. Do most people slap it back on without doing a surface cut for a blown gasket? How do you know when to do both the top and bottom surface if all you want to do is replace the gasket? Does it really matter? Is it possible to do the old gasket removal in-place? Deciding between a new/used engine or rebuild can be a fine line. Please do make a video about it and anything else you want really. :)
DJDevon3 3 months ago
@DJDevon3 The service limit for a cylinder head is .002". The deviation in this video was .0005", or 1/4 of the way to the service limit. Really I don't have to get it resurfaced if I wanted to just slap another composite gasket back in there... but if I wanted to put a MLS gasket in there instead, then both surfaces must be perfectly flat.
A composite gasket is more flexible and forgiving. You could get away with it if the head ins't warped out-of-spec.
Jafromobile 3 months ago
lol thats a rap. Checking my subscription page each day for you jafro! :)
RGTGAME 3 months ago 2
Fiatnutz has really good machining videos, you might like them.
iexploderacoons 3 months ago
Wating.....
roro560v8 3 months ago
@roro560v8 No... It's Thanksgiving... you got it right. We're EATING for the upcoming....
Happy Thanksgiving everybody!
Jafromobile 3 months ago 5
Eating for the up coming:)
roro560v8 3 months ago
Nice job...waiting for the u
roro560v8 3 months ago
Love your videos very happy i found you on youtube. Keep it up your a big help
cruzin33 3 months ago