Chryselr 135 1976 1359HD lwo compression

[aicomp]

Hi All,
I have an older 135 Chrysler 135 that has c0mpression of 140,140,30,140. I need to see what will cause this and then ask how to remove the powerhead. Can it be repaired without removal, or will it be necessary to remove it.
Thanks in advance,
Mike

 

[Frank Acampora]

Re: Chryselr 135 1976 1359HD lwo compression

Those year engines usually did not break piston rings. Thus, you have a damaged piston, broken head gasket or a stuck ring.

First and easiest task is to remove the head and look at the head gasket. If it appears OK, then look at the piston. If all appears OK, then replace the head and try a decarb treatment. If nothing works, then you will need to remove and examine the piston. This can be done through the front after removing the carb and manifold.

 

[aicomp]

Re: Chryselr 135 1976 1359HD lwo compression

Thanks for the reply. I will try what you have suggested.
Is there a problem with the bolts breaking when the head is removed? If so, how can I reduce the chances of bolt breakage?
Thanks,
Mike

 

[jerryjerry05]

Re: Chryselr 135 1976 1359HD lwo compression

There is only 20# of tourqe on these bolts.
Try a 3/8 socket and if it doesn't come easy?
Then you'll need a hammer,a small propane torch and PB Blaster or WD-40.
If it can set for a few days,start spraying with PB. Spray and let it set,re-spray every 5-6 hours.
Then use the torch and heat and tap with the hammer,repeat!
Do this a couple of times and then try to turn the bolt 1/32nd of a turn.
Try to tighten 1/32 and then try to loosen 1/32 then spray and heat and tap and try to unscrew or screw in and keep trying to loosen.
It can take up to an hour or more and still break the bolt. But once it's broken and the head's off it's fairly easy to remove.
I spent 3 hours getting 4 bolts loose.

 

[aicomp]

Re: Chryselr 135 1976 1359HD lwo compression

Hi,
Thanks for the great answers. I will try all of these things. I will also take pics and write up what I do, showing both the good and bad.
What is the process to decarb the piston while it is still in the motor? I will try that also. How is a stuck ring freed up while in the motor?
Sorry for all the questions, but I have never tried this before.
Mike

 

[aicomp]

Re: Chryselr 135 1976 1359HD lwo compression

Hi,
Thanks for the great answers. I will try all of these things. I will also take pics and write up what I do, showing both the good and bad.
What is the process to decarb the piston while it is still in the motor? I will try that also. How is a stuck ring freed up while in the motor?
Sorry for all the questions, but I have never tried this before.
Mike

Hi again,I answered my question about decarbing by going to the sticky like I should have in the first place.
Thanks Again,
Mike

 

[jerryjerry05]

Re: Chryselr 135 1976 1359HD lwo compression

Seafoam won't work as good as Mercurys powertune or OMCs product.
Good luck on a decrb.Usually if it's that bad it's THAT BAD and a decarb won't help.
Fill out the profile.You might be close to someone who can help??

 

[aicomp]

Re: Chryselr 135 1976 1359HD lwo compression

Seafoam won't work as good as Mercurys powertune or OMCs product.
Good luck on a decrb.Usually if it's that bad it's THAT BAD and a decarb won't help.
Fill out the profile.You might be close to someone who can help??

I will fill out the profile. I am still going to take the cylinder head off. I will probably take the intake side off also just to look. You are all so helpful.
Thanks to all.
Mike

 

[aicomp]

Re: Chryselr 135 1976 1359HD lwo compression

I took the head off today. Came off real easy , which made me suspicious. I faoud that someone had welded,( really porrly ), the #3 combustion chamber. I hope this is the only problem. There is virtually no carbon and very little scoring. The worst scoring is in a cylinder that has 145 pounds compression.
Well, Now the search for a head. I was given the boat by the owners wife. He had a stroke and cannot communicate. I was also given a 105 HP Chrysler that was for parts , model # 1057HE. The head does not look the same, but the ignition is CDI like the 135. I thought of mounting and trying it out, but found the block cracked. OH Well.
Will keep you updated.

 

[Frank Acampora]

Re: Chryselr 135 1976 1359HD lwo compression

You can NOT swap the heads from the 105 to the 135. The pistons are larger in the 135 and will hit the smaller diameter combustion chamber of the 105.

In the past, that engine ate something and was repaired. Whether or not the combustion chamber is leaking is difficult to see. there definitely is some scoring of the cylinder wall.

SO Now: the question is do you want to look for a used head and possible do some repair to the cylinder? Given the amount of damage in the combustion chamber, if it were my engine, first I would see if I could find a used head cheaply. You can use any head form any 4 cylinder Chrysler or Force with a 3.375 bore: Chrysler 115 (78 to 80),135, 140, Force 120 (91 to 99)

 

[aicomp]

Re: Chryselr 135 1976 1359HD lwo compression

You can NOT swap the heads from the 105 to the 135. The pistons are larger in the 135 and will hit the smaller diameter combustion chamber of the 105.

In the past, that engine ate something and was repaired. Whether or not the combustion chamber is leaking is difficult to see. there definitely is some scoring of the cylinder wall.

SO Now: the question is do you want to look for a used head and possible do some repair to the cylinder? Given the amount of damage in the combustion chamber, if it were my engine, first I would see if I could find a used head cheaply. You can use any head form any 4 cylinder Chrysler or Force with a 3.375 bore: Chrysler 115 (78 to 80),135, 140, Force 120 (91 to 99)

Thanks Frank,
I am going to look for a head. I am not sure where to look, but I will try. I am going to put a plug in the head and fill the combustion chamber to see if it leaks. I will also check for flatness. I just want to see if that is the only problem I had with compression in that cylinder before I buy a head.I am glad to see I have more choices for year model heads.
Mike

 

[aicomp]

Re: Chryselr 135 1976 1359HD lwo compression

You can NOT swap the heads from the 105 to the 135. The pistons are larger in the 135 and will hit the smaller diameter combustion chamber of the 105.

In the past, that engine ate something and was repaired. Whether or not the combustion chamber is leaking is difficult to see. there definitely is some scoring of the cylinder wall.

SO Now: the question is do you want to look for a used head and possible do some repair to the cylinder? Given the amount of damage in the combustion chamber, if it were my engine, first I would see if I could find a used head cheaply. You can use any head form any 4 cylinder Chrysler or Force with a 3.375 bore: Chrysler 115 (78 to 80),135, 140, Force 120 (91 to 99)

Hi Frank,
Will the 88 Force 125 P/N
F665518
fit?
Thanks,
Mike

 

[Frank Acampora]

Re: Chryselr 135 1976 1359HD lwo compression

NO! All 125 engines (Chrysler and Force) were 3.3125 bore--small bore. You have a 3.375 bore diameter

 

[aicomp]

Re: Chryselr 135 1976 1359HD lwo compression

NO! All 125 engines (Chrysler and Force) were 3.3125 bore--small bore. You have a 3.375 bore diameter

OK, Thanks,
Mike