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Timing marks?

  
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Timing marks?

 
^4lemans ^4lemans
New User | Posts: 6 | Joined: 05/10
Posted: 05/01/10
12:25 AM

I have a 70 something YH block 400. It does not have your typical 12 8 6 4 0 -4 labels cast into the timing cover. It only has 3 marks the 2 first ones spaced slightly closer than the last which is the lowest with no numbers stamped. The PO/engine builder said he just used one of the covers he had and not sure of its origin. With that said can I assume the center mark is tdc and has anyone seen timing marks like this. Also could this cover be the original to the car which is a 326 64 lemans ht.  

gtojack1366 gtojack1366
Guru | Posts: 1257 | Joined: 11/09
Posted: 05/01/10
03:38 PM

The last one is probably o ,check your top dead center with #1 piston all the way up on comp. stroke and see what lines up then mark it and use a advanced timing light to set your timing .  

^4lemans ^4lemans
New User | Posts: 6 | Joined: 05/10
Posted: 05/01/10
05:50 PM

Thought of checking tdc on #1 but thought it may be difficult to see when it was exactly on top or slightly off, timing marks are positioned close together. I will check it though.  

gtojack1366 gtojack1366
Guru | Posts: 1257 | Joined: 11/09
Posted: 05/01/10
06:16 PM

Is the engine out of the car ? The only other way is to take off the timing cover and line up the timing marks or use a degree wheel.  

^4lemans ^4lemans
New User | Posts: 6 | Joined: 05/10
Posted: 05/01/10
07:28 PM

No the motor is in the car. The car runs well, timed it by ear I do have a slight ping on accel it just bothers me not to know how to do something so basic as check timing. The ping could be caused by being to far advanced or other factors and it would be nice to put the easy one to rest first.  Won't removing the cover just tell you the relationship of the crank to the cam or is there a tdc mark inside. Has anyone seen a timing cover like this? May post pics later.  

idrivejunk idrivejunk
Addict | Posts: 5148 | Joined: 12/09
Posted: 05/01/10
08:59 PM

I have three timing covers here. 400, 428, 455. The last two have the cast-in nice easy to read big timing marks. The one off a 400 had no marks whatsoever and used a plastic timing marker. I found a couple on this page, it looks like they are for the later engines. Theres two about halfway down the page.

http://www.frankspontiacparts.com/usedparts/pontiacengineparts.htm

Pontiactimingmark  
idrivejunk

idrivejunk idrivejunk
Addict | Posts: 5148 | Joined: 12/09
Posted: 05/01/10
09:03 PM

Heres a pic of the 400 (left) and 428's:

Impact3018  
idrivejunk

tuffnuff tuffnuff
Moderator | Posts: 2567 | Joined: 12/09
Posted: 05/01/10
10:22 PM

IDJ,,,
do you have the rest of the engine, for that 428 cover?
Grin  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

gtojack1366 gtojack1366
Guru | Posts: 1257 | Joined: 11/09
Posted: 05/02/10
04:27 AM

Is this the timing cover you have ? The middle one is 0 it's from a 66 389. 67 There is also a part number on it right below the water pump in the center this one says  #9783130 The big question would be does the 66 389 have the same tdc as the 74 400 engine ? I would buy the plastic bolt on timing marker and try to match it up ! Or cut and grind off timing block and use the plastic bolt on timing marker or get the right timing cover .  

idrivejunk idrivejunk
Addict | Posts: 5148 | Joined: 12/09
Posted: 05/02/10
06:58 AM

Nope, tuff, just the box of external leftovers from a teardown that I got from a race shop. He pushed a whole barrel of stuff on me for $40 to get floor space back. I sent you the bearings.

Jack- thats one I haven't seen. Sounds just like what he has. I'll bet the #s are buried in paint.  Smile  
idrivejunk

tuffnuff tuffnuff
Moderator | Posts: 2567 | Joined: 12/09
Posted: 05/02/10
07:57 AM

Icon Quoteidrivejunk:
Nope, tuff, just the box of external leftovers from a teardown that I got from a race shop. He pushed a whole barrel of stuff on me for $40 to get floor space back. I sent you the bearings.

Jack- thats one I haven't seen. Sounds just like what he has. I'll bet the #s are buried in paint.  Smile


Bummer,,,
I was dreaming of talking you out of that 428, IF, you had some of it left.
Wishful thinking,,, never hurts to ask your bud for a favor, huh.
I'll just have to build one out of a 400 then,,,

Grin  
When The Flag Drops.,.

tuffnuff

The Bull ***t Stops.,.
tuffnuff

P. Engineer, Engine Builder

idrivejunk idrivejunk
Addict | Posts: 5148 | Joined: 12/09
Posted: 05/02/10
12:21 PM

Go for it!  Cool  What if I just carve an "N" into a scrap 400 crank, huh? Grin  
idrivejunk

^4lemans ^4lemans
New User | Posts: 6 | Joined: 05/10
Posted: 05/02/10
09:54 PM

Yes, that is the cover. So it does have #'s stamped. Motor is clean but paint must be covering them. Buying that bolt on timing marker is an excellent idea.
Thanx