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Car Forum / Honda Cars / August 200694 Accord EX Head Gasket Replacement Question
94 Honda Accord EX - 300K miles I replaced the head gasket, after "lapping to plate" both the head and deck. I took precautions to remove as much of the abrasive residue as possible, and after 110 miles I changed the oil and filter. The timing belt was installed in the "same tooth" as before, and the distributor cap is also in the same exact position. Basically, the car is set up the same as before, except now there seems to be more compression. The car runs "tighter". 1) Should I adjust anything to reduce any "negative effects" resulting from this newfound compression? Are the 300K old valves taking a beating now? 2) Since I sanded down the head and the deck, the "volume of compression" has changed. Is this noteworthy. If so, what adjustmensts might compensate for this? I am monitoring the gas mileage and keeping my eye on the oil level. I think that years ago I used to rotate the distributer cap, to somehow reduce head pressure. Thanks for all the help. Gary > 94 Honda Accord EX - 300K miles > [quoted text clipped - 4 lines] > the same exact position. Basically, the car is set up the same as before, > except now there seems to be more compression. The car runs "tighter". two things: 1. less coolant in the combustion chambers! water doesn't burn. 2. cleaned carbon deposits out therefore better gas flow. > 1) Should I adjust anything to reduce any "negative effects" resulting from > this newfound compression? Are the 300K old valves taking a beating now? no more than before. do check them for lash though. > 2) Since I sanded down the head and the deck, the "volume of compression" > has changed. Is this noteworthy. If so, what adjustmensts might compensate > for this? not so as you'd notice at this level - unless you removed a lot of material. > I am monitoring the gas mileage and keeping my eye on the oil level. > > I think that years ago I used to rotate the distributer cap, to somehow > reduce head pressure. best to leave the timing as factory. > Thanks for all the help. > > Gary > > 94 Honda Accord EX - 300K miles > > [quoted text clipped - 9 lines] > 1. less coolant in the combustion chambers! water doesn't burn. > 2. cleaned carbon deposits out therefore better gas flow. Yes. I guess the coolant wasn't doing my valves any good. Never saw coolant in the oil though. I guess that would have been next. Good thing I took Tegger's advice to "park it". > > 1) Should I adjust anything to reduce any "negative effects" resulting from > > this newfound compression? Are the 300K old valves taking a beating now? > > no more than before. do check them for lash though. What is "lash"? > > 2) Since I sanded down the head and the deck, the "volume of compression" > > has changed. Is this noteworthy. If so, what adjustments might compensate > > for this? > > not so as you'd notice at this level - unless you removed a lot of material. I don't think I removed a lot. I mostly took it off where it needed to be taken off. Getting the cylinder liners in the same plane with the rest of the deck was probably effective. > > I am monitoring the gas mileage and keeping my eye on the oil level. I'm getting somewhere around 26 mph. So far (230 miles) the oil seems steady. > > I think that years ago I used to rotate the distributer cap, to somehow > > reduce head pressure. [quoted text clipped - 4 lines] > > > > Gary >>> 94 Honda Accord EX - 300K miles >>> [quoted text clipped - 14 lines] > > Yes. I guess the coolant wasn't doing my valves any good. water's not a problem for valves as far as i'm aware. > Never saw coolant > in the oil though. that's a gasket thing, and it's rare on hondas due to the open deck design usually used. > I guess that would have been next. Good thing I took Tegger's advice to > "park it". again, open deck [if that's what you had] made that unlikely. the expensive risk of continuing to run a blown gasket is hot gas cutting of the head or block at the leakage point. >>> 1) Should I adjust anything to reduce any "negative effects" resulting > from >>> this newfound compression? Are the 300K old valves taking a beating now? >> no more than before. do check them for lash though. > > What is "lash"? lash is the gap you use feeler gauges for. needs to be periodically adjusted. google " valve lash adjustment" and you'll get loads of how-to's. it's particularly important on hondas because they tend to wear "too tight" and burn valves. most other vehicles with inferior valve train componentry wear "too loose" and valve burn is less of a risk. don't want to take the head off again do you? >>> 2) Since I sanded down the head and the deck, the "volume of > compression" [quoted text clipped - 14 lines] > I'm getting somewhere around 26 mph. So far (230 miles) the oil seems > steady. if there is a ring wear problem, it'll take a few thousand to show up. fingers crossed. >>> I think that years ago I used to rotate the distributer cap, to somehow >>> reduce head pressure. [quoted text clipped - 3 lines] >>> >>> Gary > >>> 1) Should I adjust anything to reduce any "negative effects" resulting > > from [quoted text clipped - 11 lines] > tight" and burn valves. most other vehicles with inferior valve train > componentry wear "too loose" and valve burn is less of a risk. I took your advice and did the valve adjustments today. This car has 300K. From what I can see from the previous owner's records, the valves were "inspected/adjusted" at 30K and 90K. The specs require .010 in. for the intake valves and .012 in. for the exhaust valves. Most of the intake valves were at .008 or .009. The exhaust valves were .010, except for Piston #2 which was a whopping .008. After adjusting them, I would say that the engine sounds better. Piston #2 is the one with the spark plug that I can't remove. It is about 1/4" higher than the others. Also, when I sanded down the deck, the cylinder liner for Piston #2 was recessed below the deck. So there has been some "activity" in this area. Thanks for all the advice, Gary >>>>> 1) Should I adjust anything to reduce any "negative effects" resulting >>> from [quoted text clipped - 27 lines] > Piston #2 is the one with the spark plug that I can't remove. It is about > 1/4" higher than the others. aaargh! while you had the head off, you could have dealt with this. remove the plug. brute force. clean thread from the piston side. 14mm, 1.25mm pitch tap. usually seized because the thread's been crossed [tap from the piston side fixes this], crudded up because of gas leakage [tap from the piston side fixes this] or it's the wrong plug!!! > Also, when I sanded down the deck, the cylinder liner for Piston #2 was > recessed below the deck. not necessarily connected. > So there has been some "activity" in this area. > > Thanks for all the advice, > > Gary > > Piston #2 is the one with the spark plug that I can't remove. It is about > > 1/4" higher than the others. [quoted text clipped - 4 lines] > crossed [tap from the piston side fixes this], crudded up because of gas > leakage [tap from the piston side fixes this] or it's the wrong plug!!! Yeah. I'm kicking myself. Looks like this plug is going to "go the distance". > > >>> 1) Should I adjust anything to reduce any "negative effects" resulting > > > from [quoted text clipped - 25 lines] > was a whopping .008. After adjusting them, I would say that the engine > sounds better. Observation: Since doing the valve adjustment, I find that a cold start of the engine creates an initial idle of 2000 RPM for awhile. After the engine warms up the idle speed seems to settle down to about 900 RPM in Neutral, and 850 RPM in Drive with brake on. >>>>>> 1) Should I adjust anything to reduce any "negative effects" > resulting [quoted text clipped - 33 lines] > of 2000 RPM for awhile. After the engine warms up the idle speed seems to > settle down to about 900 RPM in Neutral, and 850 RPM in Drive with brake on. that's correct behavior. |
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