Go Back   The Ford Barn > General Discussion > Model A (1928-31)

Sponsored Links (Register now to hide all advertisements)

Reply
 
Thread Tools Display Modes
Old 09-28-2019, 08:02 AM   #41
Ray in La Mesa
Senior Member
 
Join Date: May 2010
Location: La Mesa Ca
Posts: 790
Default Re: Can the TDC pin be off by 90 Degrees?

I had an engine 40 years ago that had a timing gear with the timing pin hole 180" off from where it should have been, manufactured that way. Took me a while to figure it out, finally set engine at TDC #1 and timed it. That's when I discovered the problem.
Ray in La Mesa is offline   Reply With Quote
Old 09-28-2019, 07:35 PM   #42
bbrocksr
Senior Member
 
Join Date: May 2010
Location: Yakima Washington
Posts: 586
Default Re: Can the TDC pin be off by 90 Degrees?

Quote:
Originally Posted by Tablemaker View Post
Ever since I got my 31 A from my father, it has been ďRunningĒ without the exhaust/intake manifolds flush minted to the block. In other words, the engine was been running without a flush seal on the third and fourth cylinders.

After installing a brand new pair of intake/exhaust manifolds, with copper gaskets, I now have backfire during acceleration and deceleration.

I suspected the car needed to be timed. Iíve timed the engine without relief. I now suspect that the timing gear could be off by approximately 90degrees.

I followed some advice to identify TDC for cylinder 1 (by taking off all spark plugs and watching the four cylinders rise and fall)

What Iíve found, is that the timing pin more closely aligned to TDC for cylinder 2. *AND*, if I set the timing according to when cylinder 1 is physically at TDC WILL CAUSE massive backfire.

Iím at a loss in how the engine even runs using the timing pin (since #1 cylinder in already at the bottom of the stroke) and why I cannot even get the engine running when I use what I know to be TDC for #1 according physical inspection.

Can anyone help me get my fathers car running the way it should?

Many thanks,
Did you bolt the new manifolds together and straightedge the gasket surfaces for alignment? If they are not it will suck air and backfire, Bill
bbrocksr is offline   Reply With Quote
Sponsored Links (Register now to hide all advertisements)
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump

Sponsored Links (Register now to hide all advertisements)


All times are GMT -5. The time now is 02:35 PM.