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-   Chevy/GMC 6.2L and 6.5L (https://www.dieselbombers.com/chevy-gmc-6-2l-6-5l/)
-   -   6.5 Hard cold start (https://www.dieselbombers.com/chevy-gmc-6-2l-6-5l/112894-6-5-hard-cold-start.html)

racer55 06-10-2013 11:29 PM

Would be good to know the #'s,minimum compression for a 6.5 is 400 psi.

willis964x4 06-11-2013 07:36 AM

400 psi is what my compression test showed that my truck has

racer55 06-11-2013 08:56 AM

Having the bare minimum for compression is not what I would call good,combine that with a slow cranking starter and possibly undersized batteries and you likely have the cause of your hard starting.

willis964x4 06-11-2013 02:12 PM

Ok so how do I get my compression up?

racer55 06-11-2013 02:22 PM

Faster cranking speed from a new or rebuilt gear reduction starter and good batteries like theses from walmart: EverStart® Battery MAXX-78N (if made by johnson controls) or rebuild the engine.

willis964x4 06-11-2013 02:48 PM

Yea rebuilding the engine ain't an option right now, not even close to an option, so batteries and start it is

detroitdiesel idi 06-11-2013 11:31 PM

Worn rings/cylinder bore and or valves would cause low compression hows the blowby?

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Could be highly likely as 6.5's in the duallys are usually the first to go as theyve generally been worked harder

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Or you could sell me the truck and give me a killer deal:jump:

racer55 06-12-2013 10:35 AM

Fix the starter first and see how that goes.

Then if little improvement as a last ditch effort you could add a can or 2 of engine restorer to the oil to see if any compression improvement can be had-it is little more than a bandaid though that used car dealers use to get worn out crap past buyers for a few weeks.

willis964x4 06-14-2013 11:58 AM


Originally Posted by detroitdiesel idi (Post 1011984)
Worn rings/cylinder bore and or valves would cause low compression hows the blowby?

---AutoMerged DoublePost---

Could be highly likely as 6.5's in the duallys are usually the first to go as theyve generally been worked harder

---AutoMerged DoublePost---

Or you could sell me the truck and give me a killer deal:jump:

You won't like my killer deal haha, but everything is for sale for the right price lol

---AutoMerged DoublePost---


Originally Posted by racer55 (Post 1012025)
Fix the starter first and see how that goes.

Then if little improvement as a last ditch effort you could add a can or 2 of engine restorer to the oil to see if any compression improvement can be had-it is little more than a bandaid though that used car dealers use to get worn out crap past buyers for a few weeks.

I'm gonna get a new starter and new batteries as soon as I get the $$ and see what happens


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