Question about Cars & Trucks

Open Question

My 87 lt300e has 80 psi in compression is it my rings are going bad?

Posted by on

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Ad

SOURCE: mb 300 se 1993 good compression specs?

its fine. if any one cylinder is 15% lower thats when you could have a rough running engine

Posted on Nov 20, 2009

Ad
  • 57 Answers

SOURCE: dose 80/70 psi [compression] mean the timing has

If that low in all cylinders, belt has probably jumped. If that low in just one cylinder, then could be head gasket, valve, etc.

Posted on Jan 16, 2010

ramairgto72
  • 75 Answers

SOURCE: 1968 beetle over heated and now it wont start,did

This sounds like a classic case of blown head gasket.

You seem to know some about cars, however I will attempt to give you my best answer.

You have a gasket that seals the engine to the head, when you over heat this gasket gets punished and in some cases the head can get warped and the seal between the engine and head is lost resulting in your loss of compression.

You need to remove the head for a better look, take the head to a machine shop and have them check it for warped condition, if so see if it can be machined flat, also look into a rebuilt head, it may just be cheaper to do that then the work to fix your original.

As well your going to have to find the reason the car over heated in the first place..

This might be a good time to see if the car is worth fixing?!

Posted on Dec 29, 2010

  • 42841 Answers

SOURCE: How much compression should a Cushman truckster with a omc engine have

cranking compression pressure is 130psi engine hot.
go on line , type in marin.edu and there is a full manual for the engine.
I found it by going google and typing in--- compression pressure for cushman truckster omc engine.

Posted on Feb 08, 2015

Testimonial: "Thanks Bill. I will checkout the web site. Your information was very helpful. Thanks again."

  • 42841 Answers

SOURCE: Low overall compression in 1996 honda accord 4cyl 129.75 psi avg.

the compression pressures are on the low side. The indications are worn rings as the pressure readings come up when the ring seal is improved with the addition of oil. The bores will be worn in a taper and if the head was to come of there would be a noticeable lip where the top ring stops in the cylinder
rings and cylinders wear equally but rings suffer from a loss of tension, and an increased ring gap that allows more compression to escape to the sump
Do you need to do something about it--
if there is an oil consumption problem( smokey) then yes
If the economy is acceptable to you then --no --not immediately
What should you consider in making a decision----
1. good engines are available from japanese spares ( imported engines with less than 30.000klms on the engine for a fair price
2. consider what is termed a "short motor" which is the block,crank, pistons ,rings,oil pump and sump all new
What you should not consider is a quickie fix--set of rings and nothing else as this will cost you more in the long run.

Posted on Feb 20, 2015

Testimonial: "what do you mean by worn in a taper"

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

What should the psi compression be thanks.


It can vary between make and model of car. However, a general rule of thumb is that 135+ average is okay. Less than 85psi is pointing at something seriously amiss in the engine.

It can vary - some cars may have 125psi as 'average' compression.

Don't expect each cylinder to give the same compression reading as there will be a fluctuation. Another general rule of thumb is that there shouldn't be more than 10% variation between the readings. That is, if cylinder No1 is 135 psi, cylinder No2 shouldn't be less than '125 ish'.

If you suspect you may have compression issues, it's quite easy to do a bit of fault finding. Warm the engine first so that the pistons are expanded in the cylinders. Then do a dry compression (normal) test.

Here's some examples of compression tests on a 4 cylinder engine:
130 127 129 127

All compression readings are within 10% of each other. Fine.

Example 2:
95 95 129 127
Here, a low compression reading on cylinder 1 and 2 suggests a problem. It may be due to a faulty head gasket/cylinder head allowing compressed gases to be transferred via the defective head gasket from one cylinder to another.

Example 3:
130 80 129 127
Cylinder No2 has a problem. It's compression is way down. The other three cylinders are fine. So .. what is the cause of the low compression on cylinder 2? It could be a broken ring/cracked piston or a burnt exhaust valve.

This is where you do a second compression test - called the 'wet' test.

Squirt some light engine oil into each cylinder. Aim for the cylinder walls so that the oil can find its way down the walls and around the piston rings. Place a rag over each spark plug hole and spin the engine to expel excess oil.

The oil that you have sprayed into each cylinder will form a 'seal' around the piston ring. Do another compression test and note down the readings. Here's example 3 again:
Example 3:
130 80 129 127
.. with the low compression on cylinder 2.

If after carrying out the 'wet' compression test you have a reading along the lines of
130 100 129 127
suggests that the bore/piston rings in cylinder 2 are at fault. The compression has increased on No2 cylinder because of the oil forming a seal around the rings.

If there is no increase in psi on the wet test i.e
130 80 129 127
This suggests a burnt exhaust valve.

May 17, 2016 | Cars & Trucks

1 Answer

I just performed a compression test on my PT Cruiser because when it died the Oil Pressure Lightindicating low pressure came on & has remained on & I was told to check the compression.


From what you are saying you have no compression on 2 cylinders . which means that the rings are broken or worn out or you have a head gasket blown on 2 pistons . . Head off sump off replace rings , Surface the head new head gasket , big work

May 02, 2016 | 2002 Chrysler PT Cruiser Limited

1 Answer

Why is there a cylinder 2 misfire?


Check these three things in the misfiring cylinder: spark, gas, and compression. One of them is wrong or missing. For spark check the spark plug and wire. Make sure you have spark on the plug wire, a strong blue spark. For gas, the fuel/air mixture may be wrong. Does the fuel injector pulse, putting gas into the cylinder? Possibly you may have a leaking injector or a clogged injector.

If gas and spark seem okay, you need to check compression in the cylinder. Low compression will cause a misfire. If compression is 20 or 25% lower than adjacent cylinders, that could be causing a misfire. For example, say numbers 1 and 3 cylinders had about 150 psi compression. 80% of 150 = 120, so if cylinder 2 is 120psi or less, that could be setting the misfire code. Low compression can be caused by valves not seating well, or bad piston rings, bad head gasket- something in the combustion area of the cylinder is losing compression.

Aug 17, 2015 | 2006 Mazda Tribute

1 Answer

How much compression should a Cushman truckster with a omc engine have


cranking compression pressure is 130psi engine hot.
go on line , type in marin.edu and there is a full manual for the engine.
I found it by going google and typing in--- compression pressure for cushman truckster omc engine.

Feb 07, 2015 | Cars & Trucks

1 Answer

What is the Compression supposed to be for a 1987 Toyota Pick up 22R with carb, 4 cyl.???


A new engine would be about 180 psi for each cylinder. As the miles add up and wear occurs, compression will get lower. The important thing is that compression is even and balanced-lowest compression reading should be within 75% of the highest cylinder's compression. Some Toyota engines had a minimum allowable compression of about 135 psi, but if compression is balanced, you could have average compression as low as 125 psi and engine would still run good, some loss of power but still acceptable, and oil consumption would not be that bad.
If cylinder compression is below 120 psi as an average, you should be looking into a rebuild event-rings and valves need attention. If any cylinder is below 100 psi, it may not even fire, certainly will produce no power, and could be a head gasket failure, very worn rings, or valve problems.
Remember the important thing is to find compression readings that are very close to each other. I have an '87 Sentra with 75,000 miles(true!)-lowest comp. is 160, highest is 165 psi-runs great, good power. Also a '79 Datsun pickup (with god only knows how many miles-about 200,000 maybe). Compression is about 125-135 psi, fairly well balanced-noticeable loss of power, very little oil burning, still runs fair to good-dependable, at least.
That should give you an idea of what to look for. Good luck.

Aug 29, 2013 | 1987 Toyota Pickup

1 Answer

1995 toyota will die and will not start until engine is cold


Your problem sounds like either your fuel pump is cutting out when hot,,or the condencer or coil or you are losing compression due to piston rings worn or broken.
So first get a compression test if all cylinders are around 110 cold then check again when hot they should be up by 20 psi even if 1 or 2 cylinders are down to 80 it could be valve problem so get a WET and DRY test done, but once you have ruled out the compression and its ok then you need to look further.

Let me know how you go. RON

Jan 09, 2011 | 1995 Toyota Camry

1 Answer

2001 Dodge Caravan P0304 misfire code. 3.3 liter engine approx 141k miles. Took to a local shop to be checked out. They indicated that the fuel injection system was working correctly. they also...


remove No. 4 plug add teaspoon of engine oil, compression test if compression rises 120 psi plus, points to broken piston rings, below 90 psi burnt or stuck exhaust valve.

May 01, 2017 | 2001 Dodge Caravan

2 Answers

Cylinder 1 is at 125 psi and 2,3,4 and 5 is about 180 psi.. what could be causing this problem?


bad rings you can add a teaspoon of oil the the cylinder in question and redo the compression test if the compression goes up then the rings are bad if the compression stays the same i would be looking at a burned or bent valve or bad head gasket.

Dec 16, 2010 | Acura TL Cars & Trucks

2 Answers

Smoke from exhaust; bad cylinder rough running


sounds like a head gasket or warped head. go buy a compression teseter. pull the spark plug wires off. remove spark plugs insert teset. turn engine over 3 times for each cylinder. should be within 10-15 of each other. check dipstick look to see if oil is milky.

Oct 05, 2009 | 1998 Oldsmobile Intrigue

1 Answer

Compression check


The compressions you mentioned...Good?
No. Not at all.
Those compression reading indicate either really bad/worn piston rings, or valves that are not sealing properly, or both.
Normal compression readings should be at or above 140 PSI, +/5 5 PSI difference, no more.Save your money, and look for another unit. This engine is going to cost you a lot of money to make it right.

Mar 17, 2009 | 1989 Toyota Pickup SR5

Not finding what you are looking for?
Cars & Trucks Logo

Related Topics:

31 people viewed this question

Ask a Question

Usually answered in minutes!

Top Cars & Trucks Experts

yadayada
yadayada

Level 3 Expert

76164 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22156 Answers

Randy Ohler

Level 3 Expert

14585 Answers

Are you a Car and Truck Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...