Pennock's Fiero Forum
  Technical Discussion & Questions - Archive
  How to find compression stroke on cylinder #1

T H I S   I S   A N   A R C H I V E D   T O P I C
  

Email This Page to Someone! | Printable Version


How to find compression stroke on cylinder #1 by NashvilleFiero
Started on: 05-17-2008 10:51 AM
Replies: 10
Last post by: NashvilleFiero on 05-18-2008 09:42 AM
NashvilleFiero
Member
Posts: 555
From: Nashville, TN
Registered: Apr 2008


Feedback score: (1)
Leave feedback

Rate this member

Report this Post05-17-2008 10:51 AM Click Here to See the Profile for NashvilleFieroSend a Private Message to NashvilleFieroDirect Link to This Post
Hi Guys!
Well I put the new distributor in. It went fwap...fwap..fwap. KABOOM! (neighbors love me). Moved it ahead a tooth it went FWAP FWAP FWAP nada. Moved it behind a tooth, it went sounded congested, like the compression strokes were fighting.

Ok, so I am off a gear or two! : ) I need to find the compression stroke on cylinder #1. How is this done? I have a compression gauge and a timing light.

What's a good Fiero weekend project without the local Fire Department involved? LOL

------------------
If you ever have a questions about the sincerity of the circle of Fiero owners on this site, take a look at:
"In Memoriam: Fiero Members"

Pretty impressive.....

Avatar is of an actual Fiero on fire

IP: Logged
PFF
System Bot
fieroguru
Member
Posts: 11285
From: Champaign, IL
Registered: Aug 2003


Feedback score:    (45)
Leave feedback





Total ratings: 255
Rate this member

Report this Post05-17-2008 11:05 AM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruDirect Link to This Post
Remove the #1 spark plug and hold your finger over the hole while a buddy hand cranks the engine over. When you feel the pressure increasing you will be coming up to TDC on the compression stroke. Continue to rotate the crank until the timing mark is lined up with the base ignition setting. Install your dist and make sure the end of the rotor is pointing to the #1 spark plug terminal. Get it running and then set the timing with a timing light.
IP: Logged
TK
Member
Posts: 10009
From:
Registered: Aug 2002


Feedback score: (2)
Leave feedback





Total ratings: 200
Rate this member

Report this Post05-17-2008 11:52 AM Click Here to See the Profile for TKSend a Private Message to TKDirect Link to This Post
If for some reason you can't trust your timing mark, once you've done the above, stick a screwdriver into the plug hole and against the piston top. Hold the screwdriver with your hand against the head and turn the crank. You can feel the screwdriver get pushed out as the piston gets to the top and then start to drop as the piston starts its travel down.

Go back and forth until you feel the screwdriver stop moving when the piston gets to the top. You will find a spot where turning the crank slightly doesn't seem to make the screwdriver move up or down. You will easily be within a couple of degrees max of TDC and close enough to stab the distributor. At this point I will tighten down the marker on the timing cover. The error in timing will be small.

I find the #1 tower on the dist cap and mark the base for #1 and remove the cap. Then I install the distributor and rotate the base until the rotor is pointing at the #1 mark on the base. If I can't rotate the base enough (the connectors hit the shields), I remove the distributor and rotate the shaft a tooth or two and install it again until I can rotate the base to align the mark and not hit anything when I turn it in each direction a bit. You need some range to get to the base timing. Don't be shocked if you have to do that again after you fire up the engine. The connectors (on the V6 at least) don't have tons of room.

Reinstall the cap and it will start right up assuming everything else is work. Set the timing.

[This message has been edited by TK (edited 05-17-2008).]

IP: Logged
NashvilleFiero
Member
Posts: 555
From: Nashville, TN
Registered: Apr 2008


Feedback score: (1)
Leave feedback

Rate this member

Report this Post05-17-2008 01:05 PM Click Here to See the Profile for NashvilleFieroSend a Private Message to NashvilleFieroDirect Link to This Post
 
quote
Originally posted by TK:

If for some reason you can't trust your timing mark, once you've done the above, stick a screwdriver into the plug hole and against the piston top. Hold the screwdriver with your hand against the head and turn the crank. You can feel the screwdriver get pushed out as the piston gets to the top and then start to drop as the piston starts its travel down.

Go back and forth until you feel the screwdriver stop moving when the piston gets to the top. You will find a spot where turning the crank slightly doesn't seem to make the screwdriver move up or down. You will easily be within a couple of degrees max of TDC and close enough to stab the distributor. At this point I will tighten down the marker on the timing cover. The error in timing will be small.

I find the #1 tower on the dist cap and mark the base for #1 and remove the cap. Then I install the distributor and rotate the base until the rotor is pointing at the #1 mark on the base. If I can't rotate the base enough (the connectors hit the shields), I remove the distributor and rotate the shaft a tooth or two and install it again until I can rotate the base to align the mark and not hit anything when I turn it in each direction a bit. You need some range to get to the base timing. Don't be shocked if you have to do that again after you fire up the engine. The connectors (on the V6 at least) don't have tons of room.

Reinstall the cap and it will start right up assuming everything else is work. Set the timing.



Turning crank by hand or by starter?

------------------
If you ever have a questions about the sincerity of the circle of Fiero owners on this site, take a look at:
"In Memoriam: Fiero Members"

Pretty impressive.....

Avatar is of an actual Fiero on fire

IP: Logged
fieroguru
Member
Posts: 11285
From: Champaign, IL
Registered: Aug 2003


Feedback score:    (45)
Leave feedback





Total ratings: 255
Rate this member

Report this Post05-17-2008 02:09 PM Click Here to See the Profile for fieroguruSend a Private Message to fieroguruDirect Link to This Post
By hand. Sticking a screwdriver in the spark plug hole and spinning the engine with the starter is a very bad idea.
IP: Logged
NashvilleFiero
Member
Posts: 555
From: Nashville, TN
Registered: Apr 2008


Feedback score: (1)
Leave feedback

Rate this member

Report this Post05-17-2008 03:07 PM Click Here to See the Profile for NashvilleFieroSend a Private Message to NashvilleFieroDirect Link to This Post
 
quote
Originally posted by fieroguru:

By hand. Sticking a screwdriver in the spark plug hole and spinning the engine with the starter is a very bad idea.


Kinda thought so : )

------------------
If you ever have a questions about the sincerity of the circle of Fiero owners on this site, take a look at:
"In Memoriam: Fiero Members"

Pretty impressive.....

Avatar is of an actual Fiero on fire

IP: Logged
NashvilleFiero
Member
Posts: 555
From: Nashville, TN
Registered: Apr 2008


Feedback score: (1)
Leave feedback

Rate this member

Report this Post05-17-2008 03:08 PM Click Here to See the Profile for NashvilleFieroSend a Private Message to NashvilleFieroDirect Link to This Post

NashvilleFiero

555 posts
Member since Apr 2008
 
quote
Originally posted by NashvilleFiero:


Kinda thought so : )




Would a max compression reading give me the same thing?

------------------
If you ever have a questions about the sincerity of the circle of Fiero owners on this site, take a look at:
"In Memoriam: Fiero Members"

Pretty impressive.....

Avatar is of an actual Fiero on fire

IP: Logged
Patrick
Member
Posts: 30539
From: Vancouver, British Columbia, Canada
Registered: Apr 99


Feedback score: (1)
Leave feedback





Total ratings: 443
Rate this member

Report this Post05-17-2008 03:14 PM Click Here to See the Profile for PatrickClick Here to Email PatrickSend a Private Message to PatrickDirect Link to This Post
 
quote
Originally posted by fieroguru:

Sticking a screwdriver in the spark plug hole and spinning the engine with the starter is a very bad idea.



That's for damn sure!

IP: Logged
NashvilleFiero
Member
Posts: 555
From: Nashville, TN
Registered: Apr 2008


Feedback score: (1)
Leave feedback

Rate this member

Report this Post05-17-2008 03:18 PM Click Here to See the Profile for NashvilleFieroSend a Private Message to NashvilleFieroDirect Link to This Post
 
quote
Originally posted by Patrick:


That's for damn sure!


Ok, what is the best method of turning the engine crank?

------------------
If you ever have a questions about the sincerity of the circle of Fiero owners on this site, take a look at:
"In Memoriam: Fiero Members"

Pretty impressive.....

Avatar is of an actual Fiero on fire

IP: Logged
TK
Member
Posts: 10009
From:
Registered: Aug 2002


Feedback score: (2)
Leave feedback





Total ratings: 200
Rate this member

Report this Post05-17-2008 11:51 PM Click Here to See the Profile for TKSend a Private Message to TKDirect Link to This Post
Socket and long ratchet.

You will never get the engine to stop on the compression stroke using the starter except randomly.

[This message has been edited by TK (edited 05-17-2008).]

IP: Logged
NashvilleFiero
Member
Posts: 555
From: Nashville, TN
Registered: Apr 2008


Feedback score: (1)
Leave feedback

Rate this member

Report this Post05-18-2008 09:42 AM Click Here to See the Profile for NashvilleFieroSend a Private Message to NashvilleFieroDirect Link to This Post
 
quote
Originally posted by TK:

Socket and long ratchet.

You will never get the engine to stop on the compression stroke using the starter except randomly.



Thanks!
Brit

------------------
If you ever have a questions about the sincerity of the circle of Fiero owners on this site, take a look at:
"In Memoriam: Fiero Members"

Pretty impressive.....

Avatar is of an actual Fiero on fire

IP: Logged
PFF
System Bot



All times are ET (US)

T H I S   I S   A N   A R C H I V E D   T O P I C
  

Contact Us | Back To Main Page

Advertizing on PFF | Fiero Parts Vendors
PFF Merchandise | Fiero Gallery | Ogre's Cave
Real-Time Chat | Fiero Related Auctions on eBay



Copyright (c) 1999, C. Pennock