01-09-2013, 11:33 PM
|
#1
|
|
Junior Member
|
|
Join Date: Jan 2013
Location: Va
Posts: 2
|
|
|
Junior Member
Join Date: Jan 2013
Location: Va
Posts: 2
|
Engine reassembly
I've gotten my hands on a 5Vz-FE V6 from a 1997 4Runner that was disassembled for a head gasket replacement. The guy that took it apart didn't set the engine to TDC and didn't mark the cam positions when we removed them. This is my first Toyota V6 repair and I would like information on how to tell when I have the motor in TDC COMPRESSION. I've got the crank pully set to TDC, but without a distributor or cams in place, how can I make sure I'm in the compression stroke?
|
|
 Reply With Quote
|
|
01-09-2013, 11:39 PM
|
#2
|
 |
Senior Member
|
|
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
|
|
|
Senior Member
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
|
If the pulley is at tdc. It is already at the compression stroke.
The position of the camshafts sets which cycle the compression stroke is.
Set you tdc, align the timing belt marks with your cams shafts and you should be all set to go.
__________________
1999 Limited 4runner in Silver - 9th and 10th Injected TRD Supercharged 4.7 2UZ-FE swap - AISIN Manual hub lockers - Retrofitted E-locker - Downey Off road Coilovers & adjustable Pan Hard Bar - Whelen PA - 2" Personally made Body Lift - Eclipse Navigation Radio - Spider Trax - Custom Hidden Winch - Triple Electric Fans - Running boards off then back on again - Ghetto Cold Air Intake - Sequoia Brakes - V8 Badge (for extra horse power)
2002 SR5 Tacoma Extended Cab also in Silver On 37's and Guns for sale
Last edited by Singtoe; 01-09-2013 at 11:41 PM.
|
|
|
Reply With Quote
|
|
01-09-2013, 11:43 PM
|
#3
|
 |
Senior Member
|
|
Join Date: Feb 2011
Location: Philadelphia, PA
Posts: 3,921
|
|
|
Senior Member
Join Date: Feb 2011
Location: Philadelphia, PA
Posts: 3,921
|
Quote:
Originally Posted by Singtoe
If the pulley is at tdc. It is already at the compression stroke.
|
I believe this is correct. The pulley won't be at TDC at any other stroke.
|
|
|
Reply With Quote
|
|
01-09-2013, 11:56 PM
|
#4
|
 |
Senior Member
|
|
Join Date: Jun 2007
Location: Rexburg ID
Age: 34
Posts: 4,403
|
|
|
Senior Member
Join Date: Jun 2007
Location: Rexburg ID
Age: 34
Posts: 4,403
|
but his problem is that the belt was already taken off. where are the marks on the cams and where should they align?
__________________
Never ask a girl if shes sick, she might not be wearing any make up. - lets just say she went storming off.
Never tell your wife she looks tired, they tend to hit and say that means she looks ugly. (weird logic i know)
|
|
|
Reply With Quote
|
|
01-10-2013, 12:01 AM
|
#5
|
|
Senior Member
|
|
Join Date: Feb 2011
Location: Philadelphia, PA
Posts: 3,921
|
|
|
Senior Member
Join Date: Feb 2011
Location: Philadelphia, PA
Posts: 3,921
|
The cams have marks on the gears when they're installed. You line up those marks. Then you bolt on the cam pulley, rotate them and you're good. The pulley only goes on one way.
Same with the crank pulley, when you have the mark aligned you're at TDC. Doesn't matter that the cams were removed.
|
|
|
Reply With Quote
|
|
01-10-2013, 12:45 AM
|
#7
|
|
Senior Member
|
|
Join Date: Jul 2012
Location: Odessa/Midland TX
Posts: 3,711
|
|
|
Senior Member
Join Date: Jul 2012
Location: Odessa/Midland TX
Posts: 3,711
|
Quote:
Originally Posted by Singtoe
If the pulley is at tdc. It is already at the compression stroke.
The position of the camshafts sets which cycle the compression stroke is.
Set you tdc, align the timing belt marks with your cams shafts and you should be all set to go.
|
Well...at TDC , can it be the exhaust stroke as well?
Isn't the piston comes to the top twice (compression and exhaust) in a one full 4 stroke cycle (720 degrees)? His question is how to find out the compression stroke.
TDC can be easy to find in an engine with a distributor.
Last edited by nissanh; 01-10-2013 at 12:49 AM.
|
|
|
Reply With Quote
|
|
01-10-2013, 01:15 AM
|
#8
|
 |
Member
|
|
Join Date: Jun 2012
Location: Heber, UT
Posts: 122
|
|
|
Member
Join Date: Jun 2012
Location: Heber, UT
Posts: 122
|
Quote:
Originally Posted by agloukhoff
|
bingo.
your crank gear is keyed, each 360 degree rotation brings you back to tdc on cyl #1. so as long as the mark on your crank pulley gear is pointing up/aligned with the mark. your at tdc.
__________________
"...but does it float?"
|
|
|
Reply With Quote
|
|
01-10-2013, 01:16 AM
|
#9
|
|
Senior Member
|
|
Join Date: Feb 2011
Location: Philadelphia, PA
Posts: 3,921
|
|
|
Senior Member
Join Date: Feb 2011
Location: Philadelphia, PA
Posts: 3,921
|
Quote:
Originally Posted by nissanh
Well...at TDC , can it be the exhaust stroke as well?
Isn't the piston comes to the top twice (compression and exhaust) in a one full 4 stroke cycle (720 degrees)? His question is how to find out the compression stroke.
TDC can be easy to find in an engine with a distributor.
|
I don't believe the mark would line up when it's on the exhaust stroke though.
|
|
|
Reply With Quote
|
|
01-10-2013, 01:23 AM
|
#10
|
|
Senior Member
|
|
Join Date: Jul 2012
Location: Odessa/Midland TX
Posts: 3,711
|
|
|
Senior Member
Join Date: Jul 2012
Location: Odessa/Midland TX
Posts: 3,711
|
Quote:
Originally Posted by PitbullRescuer
I don't believe the mark would line up when it's on the exhaust stroke though.
|
You mean the mark in the crank with the oil pump housing? or cam with the T-belt cover plate?
The head is off the engine and all he got is the crank/oil pump marks.
|
|
|
Reply With Quote
|
|
01-10-2013, 01:51 AM
|
#11
|
 |
Member
|
|
Join Date: Aug 2010
Location: Orem, UT
Posts: 234
|
|
|
Member
Join Date: Aug 2010
Location: Orem, UT
Posts: 234
|
The only timing to be done is lining up all the appropriate marks when youre ready to put the TB on. This is after your heads, cams, and pulleys are all reinstalled. Spin them all independently as much as you like, it makes no difference.
__________________
2000 SR5 Sport 4x4. Head Gasket mod. Rear Axle Seal mod. Functioning 4x4 mod. SOLD
2004 DC Tacoma TRD. Same guts, different skin, e-locked. |
|
|
Reply With Quote
|
|
01-10-2013, 06:59 AM
|
#12
|
|
Senior Member
|
|
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
|
|
|
Senior Member
Join Date: Oct 2010
Location: Raleigh, North Carolina
Posts: 3,262
|
Quote:
Originally Posted by nissanh
Well...at TDC , can it be the exhaust stroke as well?
Isn't the piston comes to the top twice (compression and exhaust) in a one full 4 stroke cycle (720 degrees)? His question is how to find out the compression stroke.
TDC can be easy to find in an engine with a distributor.
|
Yes, if it is on TDC, It could also be on the exhaust stroke. But with the TB off, there is no exhaust stroke because the valves aren't opening up.
The nice thing about the yota is that there is no distributor. so nothing to line up or parts to wear out.
FWIW. If your motor was on the exhaust stroke at TDC, not rotating the Crank, you can slip the timing belt off, spin your cam shafts 180 degrees, re-install the timing belt and vola, your motor is on the compression stroke.
__________________
1999 Limited 4runner in Silver - 9th and 10th Injected TRD Supercharged 4.7 2UZ-FE swap - AISIN Manual hub lockers - Retrofitted E-locker - Downey Off road Coilovers & adjustable Pan Hard Bar - Whelen PA - 2" Personally made Body Lift - Eclipse Navigation Radio - Spider Trax - Custom Hidden Winch - Triple Electric Fans - Running boards off then back on again - Ghetto Cold Air Intake - Sequoia Brakes - V8 Badge (for extra horse power)
2002 SR5 Tacoma Extended Cab also in Silver On 37's and Guns for sale
|
|
|
Reply With Quote
|
|
01-10-2013, 09:45 AM
|
#13
|
 |
Senior Member
|
|
Join Date: Oct 2010
Location: Ozark, MO
Posts: 1,068
|
|
|
Senior Member
Join Date: Oct 2010
Location: Ozark, MO
Posts: 1,068
|
Quote:
Originally Posted by nissanh
Well...at TDC , can it be the exhaust stroke as well?
Isn't the piston comes to the top twice (compression and exhaust) in a one full 4 stroke cycle (720 degrees)? His question is how to find out the compression stroke.
TDC can be easy to find in an engine with a distributor.
|
Whether TDC (on cylinder 1) is compression or exhaust is determined by the position of the cams (TDC on the crank is TDC on either stroke). That is why you line up the crank to TDC and then install the cams with the marks at the right spot. It is a little tricky/confusing on these motors, so do follow the manual or how-to link (which I used).
Quote:
|
FWIW. If your motor was on the exhaust stroke at TDC, not rotating the Crank, you can slip the timing belt off, spin your cam shafts 180 degrees, re-install the timing belt and vola, your motor is on the compression stroke.
|
Once it's all assembled, the crank will be at TDC in compression AND exhaust stroke (irrelevant really). The cams determine if it's compression or exhaust, and, as noted, since these don't have a distributor, you just turn the crank to TDC, set the cam positions and go. Don't overthink this!
__________________
2002 T4R Limited, 191K miles - OME 883 front - LC 7 wrap/2nd gen sway bar links rear - Detroit Truetrac Diff - Cooper A/T3s - Warn M8000 - ARB Bumper - homemade (er, 'custom') rear bumper w/tire & can carrier - BajaRack - Diff Breather Mod - Hayden trans cooler - Yaesu 2M, Cobra CB - Fridge, off-road trailer with Tepui RTT (real expo poser)In Africa they say: "Buy a Land Rover and it will take you anywhere. Buy a Toyota and it will take you there ... and bring you back home." jannikt on wranglerforum.com - I'm guessing he didn't make many friends there with that line.
Last edited by 98OzarksRunner; 01-10-2013 at 09:50 AM.
|
|
|
Reply With Quote
|
|
01-10-2013, 12:35 PM
|
#14
|
|
Senior Member
|
|
Join Date: Jul 2012
Location: Odessa/Midland TX
Posts: 3,711
|
|
|
Senior Member
Join Date: Jul 2012
Location: Odessa/Midland TX
Posts: 3,711
|
Quote:
Originally Posted by Singtoe
Yes, if it is on TDC, It could also be on the exhaust stroke. But with the TB off, there is no exhaust stroke because the valves aren't opening up.
The nice thing about the yota is that there is no distributor. so nothing to line up or parts to wear out.
FWIW. If your motor was on the exhaust stroke at TDC, not rotating the Crank, you can slip the timing belt off, spin your cam shafts 180 degrees, re-install the timing belt and vola, your motor is on the compression stroke.
|
Yeah...make sense to me now. Thank you so much for the clarification.
Thanks Pal...
So bring it to TDC and put the belts on. Easy...
nissanh
|
|
|
Reply With Quote
|
|
01-10-2013, 12:37 PM
|
#15
|
|
Senior Member
|
|
Join Date: Jul 2012
Location: Odessa/Midland TX
Posts: 3,711
|
|
|
Senior Member
Join Date: Jul 2012
Location: Odessa/Midland TX
Posts: 3,711
|
Quote:
Originally Posted by 98OzarksRunner
Whether TDC (on cylinder 1) is compression or exhaust is determined by the position of the cams (TDC on the crank is TDC on either stroke). That is why you line up the crank to TDC and then install the cams with the marks at the right spot. It is a little tricky/confusing on these motors, so do follow the manual or how-to link (which I used).
Once it's all assembled, the crank will be at TDC in compression AND exhaust stroke (irrelevant really). The cams determine if it's compression or exhaust, and, as noted, since these don't have a distributor, you just turn the crank to TDC, set the cam positions and go. Don't overthink this!
|
Very nice explanation as well. Man these engines are easy to work than 4afe.
Thanks!!1
|
|
|
Reply With Quote
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is On
|
|
|
|
Linear Mode
