7M pistons taking out
- Thread starter Bass_Man
- Start date
when i took mine out i used the TSRM procedure. I removed the oilpan and disconnected the conrods from the crank, then used a rubber coated hammer handle to press the pistons and conrods into my hand underneath (block is upside down).
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=EM&P=70
http://www.cygnusx1.net/Supra/Library/TSRM/MK3/manual.aspx?S=EM&P=70
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Bass_Man;1289365 said:
even if you could... why? you have to put the pistons in from the top when you reinstall them.
Rennat;1289386 said:
Because I hear one knocking noise from one piston bolt and I do not want to ruin my brand new ( on 4000 km ) MHG for one stupid bolt :3d_frown: .
For me is better if there is a way to replace piston bolt from bottom side .
Please if someone of you have spare block from 7m just check if there is way to remove piston from bottom side . And also will be better if someone can make one picture of bottom block side .
CyFi6;1289372 said:
Correct, you cannot take them out the bottom. Some MHG are reuse bale. What Type do you have, I know HKS Stopper gaskets you can reuse. I have used a Hks 1.2mm HG before and had no issues.
Just do it the right way, you take the pistons out the top, you put them in the top.
Period.
First off what is a piston bolt? Second i have looked and tried and you cannot remove the piston out the bottom, the main journal webbings are in the way. Heres a shot of the bottom end for you.
CyFi6;1289441 said:
Thank you for pictures :thumbup: this is actually what I need !
And piston bolt is bolt between piston and rod .
Something like this :
http://www.made-in-china.com/showroom/cnnina/product-detailGodxtNvrhAcW/China-Piston-Bolt.html
Head need to be removed and I know about MHG reusing but do I need to grind block and head one more time ?
thats a wrist pin, and no, you are NOT going to change that without taking the head off and taking the piston out of the bore on TOP of the engine.
As far as the head and block machining, I would certainly inspect them, you may need to rework them, but if they are still straight, i would imagine you would be fine.
As far as the head and block machining, I would certainly inspect them, you may need to rework them, but if they are still straight, i would imagine you would be fine.
IwantMKIII;1289651 said:
From my point of view there is a few reasons :
1. When I ( not I but when ) rebuild engine I do not change them and they are old and worn ( around 150 000 km ) together with rods,pistons, shafts, block, head and few other parts .
2. Very low pressure of oil ( 2 bar from 2000 to 6000rpm ) because of great "high volume low pressure" 7M oil system .
3. Also because not proper set advance ( I saw this to late ) .
I think all together this reasons are absolutely enough to hear knocking :icon_roll .
Around 4000km after rebuild I start to press little more on gas pedal and after 200km I start to hear this knocking .
How do I know for sure? I do not know for sure but from this typical noise and from little more diagnostic this need to be for 80%.
i'd suspect a bearing or an improperly installed bearing before ever suspecting that. (i don't think i'd ever suspect that piece going bad unless it had it had serious flaw)
IwantMKIII;1289856 said:
Yes but noise is not from bottom side .
And when remove spark plug on cylinder 4 noise is gone . And noise is only when accelerating harshly and from 2000 rpm and above . And is not on every revolution . And all of these goes to wrist pin .
This with improperly installed bearings is not possible .
It may sound like its up top - its not. You are probably going to need to at least change/cut the crank
p5150;1290065 said:
Do you think if this noise is from bearing ( and I drive around 1000km ) noise will be on every 2-nd revolution only and will disappear when disconnect spark plug ? And also sometimes when car is cold and when I start engine in first 5-10 seconds hear this noise and after that ( oil pressure in cold start is around 3 bar depending on ambient temperature ) when car become hot you can hear this knocking only if you accelerate if gas pedal is not pressed does not meter of rpm-s engine is absolutely quiet .
And noise is like form head very short and sharp . Like from not proper adjusted valves .
I can bed for worn wrist pin :icon_razz .