Rb25 rebuild question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

Sideways_blksr20 · 10-19-2011, 11:31 PM

I've donde 10+ swaps but i've never taken a motor a part .
Heres the deal , i bought a motor set
Rb25det series 1, i did a compression test and i got this numbers. 150 135 145 150 150 150
So i went ahead and decided to replace all gaskets ,including headgasket , new timing belt , water and oil pump.
Today i removed the head and this is how it looks like.

This is how the bottom of the head looks

Walls dont look scratch but top of the pistons and end of the wall look really dirty , is this normal or should i replaced my bottom end parts too?

Sideways_blksr20 · 10-22-2011, 12:20 AM

Anyone,,,,,??????

Sileighty_85 · 10-22-2011, 08:32 AM

Looks normal, it just carbon build up. Carb cleaner and a steel wire brush will clean it up, Or get a dremel and a wire disk will clean it right up.

As for the head, when the machine shop decks it will clean off the HG residue, you can probably have them clean the combustion chamber as well

Sideways_blksr20 · 10-22-2011, 09:04 PM

thanks man ! u the only one that answered..

Sideways_blksr20 · 10-23-2011, 01:11 PM

What do u guys use for the walls , i tried with a rack but theres some residue that wont comeout

Ninjamasta04 · 10-23-2011, 01:20 PM

You already taken the motor apart might as well rebuild it with new parts, get a machine shop to resurface both head and engine.

Spencer dougherty · 10-23-2011, 02:58 PM

lol.. everything looks supper sexy.. just old and been setting for awhile.. when where done with her she will be as good as need.. see ya soon

10-19-2011, 11:31 PM	#1
Sideways_blksr20 Nissanaholic! Join Date: Oct 2008 Location: Tustin Age: 38 Posts: 1,667 Trader Rating: (38) Feedback Score: 38 reviews	Rb25 rebuild question I've donde 10+ swaps but i've never taken a motor a part . Heres the deal , i bought a motor set Rb25det series 1, i did a compression test and i got this numbers. 150 135 145 150 150 150 So i went ahead and decided to replace all gaskets ,including headgasket , new timing belt , water and oil pump. Today i removed the head and this is how it looks like. This is how the bottom of the head looks Walls dont look scratch but top of the pistons and end of the wall look really dirty , is this normal or should i replaced my bottom end parts too?

10-22-2011, 08:32 AM	#3
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	Looks normal, it just carbon build up. Carb cleaner and a steel wire brush will clean it up, Or get a dremel and a wire disk will clean it right up. As for the head, when the machine shop decks it will clean off the HG residue, you can probably have them clean the combustion chamber as well __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

10-22-2011, 12:20 AM	#2
Sideways_blksr20 Nissanaholic! Join Date: Oct 2008 Location: Tustin Age: 38 Posts: 1,667 Trader Rating: (38) Feedback Score: 38 reviews	Anyone,,,,,??????

10-22-2011, 09:04 PM	#4
Sideways_blksr20 Nissanaholic! Join Date: Oct 2008 Location: Tustin Age: 38 Posts: 1,667 Trader Rating: (38) Feedback Score: 38 reviews	thanks man ! u the only one that answered..

10-23-2011, 01:11 PM	#5
Sideways_blksr20 Nissanaholic! Join Date: Oct 2008 Location: Tustin Age: 38 Posts: 1,667 Trader Rating: (38) Feedback Score: 38 reviews	What do u guys use for the walls , i tried with a rack but theres some residue that wont comeout

10-23-2011, 01:20 PM	#6
Ninjamasta04 Join Date: May 2009 Location: New York Posts: 29 Trader Rating: (1) Feedback Score: 1 reviews	You already taken the motor apart might as well rebuild it with new parts, get a machine shop to resurface both head and engine.

10-23-2011, 02:58 PM	#7
Spencer dougherty Post Whore! Join Date: Feb 2007 Location: Santa Ana CA SideWays Performance 1(714)330-0021 Age: 42 Posts: 2,554 Trader Rating: (65) Rides Gallery: Spencer dougherty Feedback Score: 65 reviews	lol.. everything looks supper sexy.. just old and been setting for awhile.. when where done with her she will be as good as need.. see ya soon