Rebuilt 360 by major local shop,never had any power,replaced everything,didnot use it much,years went by. Checked compression one day,best cyl...

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Customer

Rebuilt 360 by major local shop,never had any power,replaced everything,didnot use it much,years went by. Checked compression one day,best cyl 100psi,worst 75. Needed to pull heads anyway to have hard seats put in,install new heads and lifters,lifters went in dry;check compression before starting 120 each cyl. O_BOY problem solved. Start engine 1 minute, shut off, check comp,back like it was100-75. SO,no oil in lifters, good compression,oil in lifter, compression bad.There is more, need to chat live or call

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Relly De Jesus
Dodge Mechanic

Hello and welcome to ExpertHelp.com! My name is Relly De Jesus and I'm going to do everything in my power to answer your question to your full satisfaction!

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Relly De Jesus
Dodge Mechanic

Hello Charles... how are you doing?

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Customer

I'm better than some

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Relly De Jesus
Dodge Mechanic

Great... May I ask if you replaced the oil pump Charles?

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Customer

yes everything was replaced oil pump is heavy duty

 

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Customer

oil pressure is good, that is not problem

 

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Relly De Jesus
Dodge Mechanic

I see... after you replaced the cylinder head the compression went good right? but after shutting it down there's a compression loss... Is that right?

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Customer

No,comp was good when lifters were dry turning with starter, lifters were new

 

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Relly De Jesus
Dodge Mechanic

Ok, Did you replace the camshaft itself, main bearings and camshaft bearings?

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Customer

yes,everything. Motor has good oil pressure and actually runs and starts great, its just that compression is not right. When I first checked it after new heads it had 120 per cyl. After I started it compression went down like with old heads. The difference is oil in the lifter

 

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Relly De Jesus
Dodge Mechanic

I assume that firing order and timing is correct, right?

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Customer

Motor runs perfect it just has little power Lucky to get 65mph, old engine ran 75 or 80. have checked all linkage, everything. It is just that I had great compression when lifters were dry and bad when they pumped up when I started engine

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Relly De Jesus
Dodge Mechanic

Piston rings replaced Charles? You put in a new piston liner in the block?

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Relly De Jesus
Dodge Mechanic

What type of engine oil are you using anyway Charles

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Customer

Yes, as I said everthing was new, motor has only 2000 miles since rebuild. When I replaced heads, I also replaced lifters, they were dry. Turned engine with starter 120 each  cylinder. It seems that valve springs are not overcoming oil pressure in lifters, but everyone says not likely springs could be that weak at idle. I have 15/30 oil

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Relly De Jesus
Dodge Mechanic

Have you tried using 20W 50W Charles?

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Customer

When I loosen rocker arm shaft bolts and let rockers get real loose compression comes back. I would normally use heavier oil in a low miles engine

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Customer

Would not use heavy oil in low miles engine

 

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Relly De Jesus
Dodge Mechanic

Ok, I believe you are using a torque wrench and the using the proper torque settings. Sometimes it's just it

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Customer

I'm 73 years old, been car mechanic since 16

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Relly De Jesus
Dodge Mechanic

Ok, Charles I have to ask my fellow mechanic for their insights about this issue. This is a tricky one considering the new heads. You okay with that? Just monitor your email for my new response so you can get back to me tomorrow

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Customer

I don't know if I have worded things correctly enough to you. But every thing seems to point to the lifters when full of oil are stronger than the valve springs so the valves don't fully shut, but since two heads and lifters act the same way, seems valves are weak, but people say impossible at low rpm for valves to show weakness. Also compression shows even lower when checking one clyinder with other 7 running at idleI will look for your reply

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Customer

Valve springs to show weakness

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Relly De Jesus
Dodge Mechanic

What brand of valve springs did you buy anyways Charles

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Customer

They are original to my knowledge, that is the only thing that isn't new

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Relly De Jesus
Dodge Mechanic

Oh... I was thinking that the valve springs are new as well. Charles, looks like that this is pretty much our problem. It can be weak and can't perform well. I would suggest COMP CAMS valve springs, it is built tough unlike others. Everything is new but the springs, I believe you'll be good after the valve springs replacement.

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Customer

Where do I find those

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Relly De Jesus
Dodge Mechanic

Please give me a bit to retrieve the details Charles. Thank you

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Relly De Jesus
Dodge Mechanic

COMP CAMS number is  ***-***-**** / 1- ***-***-**** / fax  ***-***-**** . Is there anything else I can add or help you with Charles? I'll be standing by for your response

 

 

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Relly De Jesus
Dodge Mechanic

Hello Charles

How are you doing? This is a follow up regarding my assistance. Is there anything else I can add or help you with? Let me know if it's been helpful and please keep me posted on the progress. I'll be waiting for your response.

Thank you

Relly de Jesus

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Relly De Jesus
Dodge Mechanic

Hi Charles

How are you doing? This is a follow up regarding my assistance. Is there anything else I can add or help you with? Let me know if it's been helpful and please keep me posted on the progress. I'll be waiting for your response.

Thank you

Relly de Jesus

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