Engine died while idling at stop light, cranks but won't start, 2

[Ahsai]

Just send your IMS to LN engineering for repair/rebuild. They are THE expert on IMS among other things. They will pin the sprockets and balance the shaft for you.

[Ahsai]

Now I watched the video. All the sprockets on the IMS are only interference fit (light pressure). Can you believe that? Anyway, LN Engineering can help you rebuild it.

[thatsjeek]

Hi all, 

 

Finally got a new LN intermediate shaft and engine put back together!

 

Now trying to start the engine and it won’t start, but getting some popping noises and exhaust coming out, like some cylinders are maybe firing. 

 

Attached is a video of the noise. 

 

Anyone possibly know what might be going on based on the noises?

 

IMG_1944.mov

Edited December 24, 2017 by thatsjeek
Fix video file attachment

[Ahsai]

Thanks for the update. I've completely forgotten about this thread. The cranking does not sound right at all and I have no idea about the popping noise. Have you verified timing on both banks. Many cases of non-start after rebuild was due to wrong timing...ppl forgot to rotate the crank 360 before timing the other bank. The engine ends up having 2 cylinders on opposite bank going through the same compression stroke and will be hard to crank (in addition to running on only 3 cylinders).

[thatsjeek]

On 12/23/2017 at 11:54 PM, Ahsai said:

Thanks for the update. I've completely forgotten about this thread. The cranking does not sound right at all and I have no idea about the popping noise. Have you verified timing on both banks. Many cases of non-start after rebuild was due to wrong timing...ppl forgot to rotate the crank 360 before timing the other bank. The engine ends up having 2 cylinders on opposite bank going through the same compression stroke and will be hard to crank (in addition to running on only 3 cylinders).

 

Alright wow it's really been a while! I got the timing fixed and now got everything back in the car and now it's making a bit of a different noise.

 

Sharing a video of trying to start in case it sounds familiar to someone.

 

• No faults on the durametric
• I did put new gas in, but not sure if there's old gas that is in the fuel lines still that could be causing the problem? 
• I also got new spark plugs to try that in case the ones in there have gummed up.

 

Does this cranking noise sound familiar to anyone indicating a known fix?

 

Thanks in advance!

[Loren]

2 hours ago, thatsjeek said:

 

Alright wow it's really been a while! I got the timing fixed and now got everything back in the car and now it's making a bit of a different noise.

 

Sharing a video of trying to start in case it sounds familiar to someone.

 

• No faults on the durametric
• I did put new gas in, but not sure if there's old gas that is in the fuel lines still that could be causing the problem? 
• I also got new spark plugs to try that in case the ones in there have gummed up.

 

Does this cranking noise sound familiar to anyone indicating a known fix?

 

Thanks in advance!

996-crank-no-start.mov

 

Sorry you did not attach the video - the link is dead.

[thatsjeek]

21 hours ago, Loren said:

 

Sorry you did not attach the video - the link is dead.

Whoops not sure what I did wrong, but I uploaded it to youtube to see if that works better:

 

 

[JFP in PA]

It is turning over unevenly, like it has compression some of the time and not others.  Are you absolutely sure the cam timing is correct?

 

[hardtailer]

Perhaps the valves did get bent when the pistons hit them ever so slightly the very moment the drive to the camshaft failed when the sprocket slipped on the IMS?

[thatsjeek]

On 10/16/2021 at 7:56 PM, hardtailer said:

Perhaps the valves did get bent when the pistons hit them ever so slightly the very moment the drive to the camshaft failed when the sprocket slipped on the IMS?

Curious about this, it would fail a compression test, right? 

 

On 9/29/2021 at 4:19 PM, JFP in PA said:

It is turning over unevenly, like it has compression some of the time and not others.  Are you absolutely sure the cam timing is correct?

 

 

Pulled the engine and re-set the timing, I double checked before putting it back in.  I put some fresh gas in and went to try to start and the cranking sound is identical to the video and still will not start.

 

No fault codes on durametric and battery is newer and has been kept on the trickle charger.  Wondering what other diagnostics or other things I can try. 

 

Might be calling uncle soon and look to sell as a project to someone that will bring a fresh perspective and energy, but I do have a little bit more fight in me to get this running 🤞

 

 

[hardtailer]

It wouldn't necessarily fail a compression test but I'd expect lower numbers compared to cilinders with valves that shut properly.

However, a leakdown test will let you pinpoint where the leak is (intake valves, piston rings, exhaust valves or a combo of these).