Moparts

Possible crank to lower sprocket issue.

Posted By: PUNK

Possible crank to lower sprocket issue. - 01/19/11 02:50 AM

Has anyone ever seen a crank that had the shoulder of the snout in which the lower crank sprocket backs up against be machined too much? In other words, I have an engine over here that has a crank that seems to be allowing the lower crank sprocket to slide on too far which is causing the timing chain to not be in perfect alignment. I tried another timing gear set and found it to be the same result. I guess I could shim the lower sprocket out some to fix this condition. Has anyone else seen this issue? This is a first for me. Also a first with this particular brand crankshaft also.
Posted By: Stanton

Re: Possible crank to lower sprocket issue. - 01/22/11 11:29 PM

My guess is you left out the oil slinger and that's the difference !!
Posted By: Thread Ender1

Re: Possible crank to lower sprocket issue. - 01/23/11 12:19 AM

Quote:

My guess is you left out the oil slinger and that's the difference !!

Wrong!!!! tht goes after the gear is installed 10-4
Posted By: 602heavy

Re: Possible crank to lower sprocket issue. - 01/23/11 01:46 AM

Quote:

Wrong!!!! tht goes after the gear is installed 10-4



You could of said "if i recall the slinger goes on after the gear' , now would'nt that be a better way making you're point?

All friends here i hope. ...........................................anyhow , i usually 'sling' the slinger in the corner of workshop & forget about it , so i don't remmember which way it goes on.
Posted By: Thread Ender1

Re: Possible crank to lower sprocket issue. - 01/23/11 02:12 AM

Quote:

Quote:

Wrong!!!! tht goes after the gear is installed 10-4



You could of said "if i recall the slinger goes on after the gear' , now would'nt that be a better way making you're point?

All friends here i hope. ...........................................anyhow , i usually 'sling' the slinger in the corner of workshop & forget about it , so i don't remmember which way it goes on.

What are you type "babbling" about? I don't need to state i recall anything about oil slingers. I know how they install unlike you, right? So pay attention before you type nonscense. Ok friend
Posted By: 602heavy

Re: Possible crank to lower sprocket issue. - 01/23/11 02:26 AM

Quote:

Quote:

Quote:

Wrong!!!! tht goes after the gear is installed 10-4



You could of said "if i recall the slinger goes on after the gear' , now would'nt that be a better way making you're point?

All friends here i hope. ...........................................anyhow , i usually 'sling' the slinger in the corner of workshop & forget about it , so i don't remmember which way it goes on.

What are you type "babbling" about? I don't need to state i recall anything about oil slingers. I know how they install unlike you, right? So pay attention before you type nonscense. Ok friend



Ok point taken. ..................'never confuse politeness as a sign of weakness'
Posted By: Thread Ender1

Re: Possible crank to lower sprocket issue. - 01/23/11 02:32 AM

Quote:

Quote:

Quote:

Quote:

Wrong!!!! tht goes after the gear is installed 10-4



You could of said "if i recall the slinger goes on after the gear' , now would'nt that be a better way making you're point?

All friends here i hope. ...........................................anyhow , i usually 'sling' the slinger in the corner of workshop & forget about it , so i don't remmember which way it goes on.

What are you type "babbling" about? I don't need to state i recall anything about oil slingers. I know how they install unlike you, right? So pay attention before you type nonscense. Ok friend



Ok point taken. ..................'never confuse politeness as a sign of weakness'

Mmm ok.....what an absolute tosser you are? carry on.
Posted By: 602heavy

Re: Possible crank to lower sprocket issue. - 01/23/11 02:34 AM

Sounds like you just had one.

Tosser............
Posted By: Bob_Coomer

Re: Possible crank to lower sprocket issue. - 01/23/11 02:35 AM

The crank gear may float some on the key and crank snout some in some cases (stock stuff) It will follow the cam. Were talking a movement of very little hear, but will move. How does the alignment look as far as the cam gear and crank gear is concerned? It usually wont go much farther back than the cam gear is, and most flat tappet cams will walk a hair, but mostly the spinning of the tappet will push the cam towards the back of the block, and the face of the block and back of the cam gear crown will provide the thrust and wear.
Is this a stock crank or after market? I guess a aftermarket crank could be machined wrong. Has this crank been used prior?
Posted By: rowin4

Re: Possible crank to lower sprocket issue. - 01/23/11 02:50 AM

Sorry Bob but the balancer seats hard up to the sprocket and slinger if used, if it didn't the balancer would not work. I haven't heard of your problem but if you have tried a couple of sprockets and they are in to far then it's the crank.
Posted By: Mopar-Al

Re: Possible crank to lower sprocket issue. - 01/23/11 02:52 AM

Did you spin the tc set up with the dist drive installed? Is it possible you pushed the rear cam plug to far in? Never saw that problem before. tight cam bearing not letting cam go back all the way? these are things I would check if you haven't already.
Posted By: 602heavy

Re: Possible crank to lower sprocket issue. - 01/23/11 02:56 AM

Have you checked crank end float?
Posted By: rowin4

Re: Possible crank to lower sprocket issue. - 01/23/11 03:02 AM

Quote:

Did you spin the tc set up with the dist drive installed? Is it possible you pushed the rear cam plug to far in? Never saw that problem before. tight cam bearing not letting cam go back all the way? these are things I would check if you haven't already.




This could be possible ,Have you tried a different upper gear? or is the upper gear seated to the block?
Posted By: Thread Ender1

Re: Possible crank to lower sprocket issue. - 01/23/11 08:54 PM

Quote:

Quote:

Did you spin the tc set up with the dist drive installed? Is it possible you pushed the rear cam plug to far in? Never saw that problem before. tight cam bearing not letting cam go back all the way? these are things I would check if you haven't already.




This could be possible ,Have you tried a different upper gear? or is the upper gear seated to the block?


Here is my opinion on the matter, if its a Chinese crank chances could very well be that crank snout is machined up to the main flange more than mornal.

I really don't see any problems with the crank sprocket fully seating rearward as the engine is rotating the chain will keep it in line and not walking but...the simplest and most cost effective repair would be to take the extra sprocket and have it milled(machined)to be used as a spacer.
Posted By: Performance Only

Re: Possible crank to lower sprocket issue. - 01/23/11 09:48 PM

Quote:

Has anyone ever seen a crank that had the shoulder of the snout in which the lower crank sprocket backs up against be machined too much? In other words, I have an engine over here that has a crank that seems to be allowing the lower crank sprocket to slide on too far which is causing the timing chain to not be in perfect alignment. I tried another timing gear set and found it to be the same result. I guess I could shim the lower sprocket out some to fix this condition. Has anyone else seen this issue? This is a first for me. Also a first with this particular brand crankshaft also.



any chance you could tell us what size engine your working on and what brands of parts your using?
Posted By: B G Racing

Re: Possible crank to lower sprocket issue. - 01/23/11 10:13 PM

Normally the crank gear should fit snug on the crank,it's shouldn't float as it should be bottomed out on the crank by the dampner.If the issue is at the crank you may have to make a spacer,I would hazzard to guess the problem is cam location.As mentioned make sure the cam plug or anything else has the cam pushed forward.Make sure the timing set is a complete and matched set.Make sure the cam gear is seated and there is nothing between it and the cam face.Some times when rotating an engine the cam walks forward,make sure you push the cam in when checking the alignment.Also check for anything between the cam and plug and make sure that none of the cam bearing are holding the cam forward because of fit.Some of what I mentioned are extreme but warrant checking.
Posted By: MR_P_BODY

Re: Possible crank to lower sprocket issue. - 01/23/11 10:46 PM

You must be talking BB stuff... if the cam is in the
right location and the crank sprocket is in too far
I would really think the snout is machined wrong...
but a spacer could be machined.... you might need to
measure another crank to make sure
Posted By: Plumcrazyracing

Re: Possible crank to lower sprocket issue. - 01/24/11 12:50 AM

I had this very same problem on my Mopar Performance 8 bolt 4.15 stroke crank for my 493 build. The problem ended up being the machining on the snout. the snout was not machined 'back' far enough. The crank gear lined up perfectly fine with the cam gear but there was about 3/32 to an 1/8 of 'shoulder' showing on the snout. I ended up machining the hub on my balancer to fit over the shoulder and rest against the crank gear. Worked very well for me. Next option would have been to pull the crank and have the snout machined correctly.
Posted By: Plumcrazyracing

Re: Possible crank to lower sprocket issue. - 01/24/11 12:59 AM

Here is a pic!

Attached picture 6434774-DSC00019.JPG
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